Scuba Diving Dangers
To stay safe when diving, it’s important to understand what the dangers are and how to mitigate your risk.
- Dangerous Sea Creatures
- Safety For Night Diving
- Safety For Wreck Diving
- What Should Divers Do For Their Own Safety?
- How Important Is A Dive Plan?
- Diving With A Buddy
- How Important Is a Buddy Check?
- What Should A buddy Check Cover?
- How To Avoid Losing Your Dive Buddy & What To Do If You Do
- Follow Established Dive Protocols
- How To Use A Safety Sausage
- How To Reduce Your Risk Of Decompression Sickness
- Flying After Diving
- Stay Fit & Healthy
- Keep Your Gear In Good Working Order
- Carry The Right Gear
- Refresh and Maintain Skills
Dangerous Sea Creatures
This is probably the section most beginner scuba divers think of first when the issue of safety is mentioned. There are other things connected with safety in scuba diving that should be addressed ahead of dangerous sea creatures, but let’s get this out of the way first.
The ocean is filled with amazing marine life, and while there is nothing in the ocean that naturally predates on humans, there are some creatures that can cause serious injury and even death.
To avoid any potential problems with marine life, a little knowledge goes a long way. If you know the creatures that you need to be aware of, then you can learn a little about their behavior and habitat. Knowing what to watch out for makes creatures easier to recognize. You’ll also be able to take steps to protect yourself, you’ll know how to respond to an encounter, and know what to do in an emergency.
There are some steps you can take on every dive:
- Don’t touch anything! Don’t pick anything up. Don’t harass anything. Wear a full suit and maintain good buoyancy. These measures will save you from inadvertently coming in to contact with anything poisonous or provoking defensive behavior.
- If your dive is a shore entry, shuffle your feet to scare away bottom dwellers and avoid stepping on them.
- Remove shiny and dangling jewelry as these can be mistaken for silvery fish by hungry hunters.
- Be aware that ascent lines, decent lines, buoy lines, and even reel lines can snag jellyfish tentacles, and they still sting even when they are no longer attached to the jellyfish.
Below is a summary of some key marine life you should be aware of:
- Sharks have a bad reputation, but unprovoked attacks on scuba divers are extremely rare. Spearfishing and surface water activities carry more risk.
- Triggerfish can be aggressively territorial. The Titan Triggerfish is particularly feisty and will chase, barge, and bite if you don’t swim out of its area.
- Blue Ringed Octopus have deadly venom which is only transferred by touch. The poison will paralyze, and there is no antidote. Patients are put on life support until the toxin is metabolized.
- Scorpionfish, stonefish and stargazers camouflage, and stonefish and stargazers can bury themselves too. The venom is on their spines. It’s very painful but not fatal.
- Lionfish have poisonous spines too, and even though they don’t hide, they can be hard to see against the reef.
- Sea snakes can be venomous, but they’re not aggressive, they are very inquisitive though. Remain calm if approached, once it’s had a look, it will move on.
- Fire coral burns and causes skin irritation.
- Stingrays have a venomous barb in their tail but will only use it in defense.
- Jellyfish stings can be painful and even fatal but not all jellyfish sting. The most dangerous are the Box jellyfish, the Portuguese Man o’ War, and the Irukandji.
- Flower Urchins and cone shells are extremely venomous if handled.
- Crown of Thorns Starfish, if touched, will cause extreme pain.
- Leopard seals and saltwater crocodiles can both be deadly, but you are unlikely to accidentally encounter either species.
Safety For Night Diving
Diving at night is a great experience. You get to see nocturnal activity and marine life, which is often quite different from what you will encounter during the day.
While your gut reaction might be that night diving is more dangerous and scarier, the only real difference between diving during the daytime is that it’s dark. To be safe, there are some things that you do need to consider.
Do I Need Training for a Night Dive?
You don’t need a night diving certification to dive at night, but it is a good idea. Making a night dive as part of your advanced training or even taking a night diving specialty will allow you to take part in this new experience under the supervision of an experienced instructor.
Torches and Lights
The recommendation is to have one main torch and a backup. If your main torch fails, you can switch to your backup and end the dive. Continuing the dive with your backup is not recommended.
There are other locations on which you might want to attach a light;
- under the boat,
- on the downline,
- on your SMB,
- on your tank valve.
It’s a good idea to choose an SMB with a reflective strip so that it’s easily visible in torchlight at night. If yours doesn’t have one, you can shine your torchlight through it which will make it glow. For extra visibility, you can buy a reflector kit for your BCD.
Before you hop in for a night check that you know how to illuminate your gauges. Most pressure gauges will glow for a while after you have ‘juiced them up’ by shining your torch on them. This technique is the same for most compasses too.
Dive computers have different methods of illumination, so check your manual for information.
Communicating During A Night Dive
Clear communication is critical on any dive. Night diving complicates hand signals because you have one hand holding the torch, and of course, you need to illuminate your hand signals for your buddy to see them.
For night diving, you might decide to show each other your gauges rather than signaling air pressure. For an ok signal, you can illuminate one hand, or you can move your torch in a circle. The same is true for signaling that something is wrong; illuminate your hand or move your torch beam horizontally side to side.
Whatever you decide to do is ok, remember to discuss it before you dive, so there is no confusion underwater.
Entry and Exits For Night Diving
The key safety aspect for safe entries and exits is to use your torch to see where you are going. Check your entry area and look for lights. When ascending, make sure you check the water in a 360-degree circle around you. Shining your torch up will allow you to see your way to the surface. Your light will also be seen on the surface and will illuminate your SMB too.
Safety For Wreck Diving
Wrecks offer an interesting alternative to coral reefs. Their history gives another depth to your dive; some are sunk intentionally to create an artificial reef and new habitats.
Do I Need Training for Wreck Diving?
You do not need a wreck qualification to dive on a wreck; you do need one to penetrate a wreck. The problem here is temptation because there’s no one to stop you. It’s all too easy to be lured into an entrance on a wreck. Looks simple enough but it’s also surprisingly easy to stir up the visibility, get lost, disorientated, snagged, and stuck.
The key safety point for wreck diving is not to enter unless you are qualified. If you have trained in the required techniques; remember your training, make sure you have the proper kit and don’t go beyond your limits.
How to Prepare for a Wreck Dive
As with any dive, a little preparation will not only improve your safety, but it will also enhance your experience. If you’re diving a new site and in a new location, it’s always a great idea to dive with a local operator. If that’s not possible, speak to divers who know the wreck well, read dive blogs and forums, and consult dive guides. Look for;
- A map or diagram with depths and special features and buoy lines
- The wreck’s history
- Conditions (current, visibility, etc.)
- Marine life (so you know what to look for and what to be aware of)
- Hazardous points
What Gear Do I Need For a Wreck Dive
For touring the outside of the wreck make sure you have the following;
To get to most wrecks, you will follow a line. These lines are often permanent, which means barnacles can grow on them, and these are surprisingly sharp. Further, there are instances where you might need to hold on to the wreck, and for this, you will want protection on your hands.
In tropical locations, you might be tempted to dive in shorts and a rash vest or a shorty wetsuit. There’s nothing wrong with diving like this, but you do give up the extra protection that a long wetsuit offers. Unless the wreck was sunk intentionally, it will often have sharp edges and jagged corners. Permanent downlines also attract growth and snag jellyfish tentacles.
Even if you are not going inside a wreck, a dive light is a great idea. It will allow you to see inside. Wrecks are often reasonably deep too so the extra light will paint the wreck in color as you pass.
You should have a knife with you as standard on any dive. Wrecks are prone to fishing line and nets, so it’s particularly important for your safety on a wreck dive.
Safety Tips For Dealing With Strong Currents
If there is current or water movement on a wreck, there are some things you can do to make your dive easier.
Hold the line. If there is a line present, use it. Otherwise, you will waste energy and gas kicking.
Use the wreck. Think of current like the wind. You can hide from the wind, and you can hide from the current. Take it slowly and be aware of changes.
Disturbances. A wreck will disrupt the water flow, and this can cause eddies and usual ebbs and flows. Water movement can cause unnerving disturbances around openings in wrecks. These movements can feel like the wreck is sucking you in, so be aware of your environment if there is water movement present.
Awareness When Diving On Wrecks
Some wrecks lie perfectly upright, but many don’t. Even a slight angle on a wreck can be strangely disorientating. Don’t rely on what your eyes and brain are telling you. Watch your gauges because it’s very easy to follow the wreck beyond your planned depth.
Wrecks often have overhead hazards even outside. To avoid nasty bumps on your head, be fully aware of what is around you.
What Should Divers Do For Their Own Safety?
On the whole, diving is a safe pastime, but it does have some risk. There are some key things you can do to reduce risk.
The first thing you can do is to make sure you are doing what you can to prevent an accident occurring.
Your second responsibility is to make sure you are properly prepared should an accident occur. Being able to respond quickly and effectively to an emergency increases the likelihood of a positive outcome.
Below we have suggestions for both prevention and preparedness.
Listen To Briefings
If you dive with a club, from a boat, or with a leader, you will be given a briefing. The information is to ensure your safety and enhance your enjoyment, so it’s important that you listen.
A briefing will contain:
- Entry and exit protocols. The time you are most at risk when diving is when you are on the surface or close to it. Each operator will have determined the safest way for you to get in and out of the water. These details will include the best practice for getting picked up too. This information can differ by dive site, so it’s important that you pay attention.
- Details of the dive plan. Understanding depth, dive time, gas checks, and navigation helps keep the group together and ensures everyone is prepared and on the same page for these key aspects.
- Details of the dive site and conditions. Some knowledge of the dive site will prepare you for the dive. Knowing what to expect takes away any surprises, and this makes for a calm dive.
Advice for emergencies
- What should you do if you lose the group?
- What does the recall signal sound like?
- Marine life and points of interest. This will naturally include any marine life that has the potential to cause harm. The briefing should also include those creatures that are unusual and good to keep an eye out for, plus those that you can expect to see.
- The dive leader’s role. This can vary by dive and by location. It’s important to know what to expect from your dive leader, where to find them, and how to recognize them.
- Hand signals. It’s hard to follow directions or answer a question if you don’t understand what is being said.
- Hazards. Dive leaders are experienced in the local waters and will make you aware of things that you should look out for. Awareness can save you from making a mistake.
- Dive Register. Every operator will have a way of checking that divers are back on board. Most operators also keep a record of dive details which can include depth, dive time, and air pressure, but it could also include your time in and out of the water. This information can be vital in an emergency, and it’s also key to understanding who has yet to return. Be clear on what’s required.
On a boat you will be given details of:
- Off-limits areas. No-go areas are for your safety and the efficient operation of the vessel.
- The location of first aid and emergency gear. If someone needs assistance, you don’t want to waste time trying to locate the relevant kit.
- How to set up and stow your gear safely. Tidiness keeps aisles and walkways clear and correct stowage ensures gear doesn’t fall and hurt someone in choppy conditions.
- While it is very important to listen, it’s equally important to speak up if there’s something that you don’t understand. You’re not silly, and you might find others have the same question. It’s far better to clarify and be sure than worry and guess.
How Important Is A Dive Plan?
If you’re following a dive leader, they will have made the dive plan. It’s part of the briefing, which we noted above. Supplemental to this, it’s a good idea to discuss with your buddy how you want to dive together.
- Will you stay on the same side throughout the dive?
- How far away from each other will you be?
- Are they taking a camera?
- Are they looking for something specific?
- Do they have any equalization issues?
- Do they know they’re carrying the correct weight or have they adjusted their weight since the last dive?
- Do you both have an SMB and are you both comfortable using one?
These points will help you stay together and highlight any areas of concern.
If you’re diving independently with your buddy you need to make a plan for your dive which will include;
- Entry and exit points
- Conservative dive time, depth, air limits
- Lost buddy, out of air, and other emergencies
The key thing with any dive plan is to stick to it. Deviation from a dive plan means that any information left with surface support will be inaccurate.
Further, if you go deeper, stay longer, or ignore gas limits, you’re putting yourself at risk of decompression sickness and running out of air.
Also, note that you could put your buddy in an uncomfortable or dangerous position if you do something that you have not discussed. Your buddy might only be comfortable or qualified to dive to a certain depth. Maybe they’re not comfortable with a swim through that you had not discussed. Entering a wreck or cave without the proper skills and gear is dangerous and leaves your buddy with a decision that they’ll wish you hadn’t forced them to make.
Diving With A Buddy
How Important Is a Buddy Check?
When you learn to dive, you are taught to make a buddy or safety check before you get in the water. Each agency has a way for you to remember it and a process that they advise you to follow.
Ultimately how you do it doesn’t matter, as long as you do it. Not only does a buddy check verify that each aspect of your kit is present and working but it familiarizes you with your buddy’s kit and vice versa. This knowledge can save vital seconds in an emergency scenario.
If you have any new kit, make sure you’ve checked it thoroughly. Is your new scuba mask a good fit? Make sure there’s no leaks prior to diving. Is the snorkel comfortable if you have to use it?
What Should A buddy Check Cover?
- How does the BCD or wing inflate and deflate?
- Where are the dump valves?
- Are the releases properly fastened and how do they operate?
- What are they carrying in the pockets?
Dive Weight System
- Is it present?
- How / where are the weights carried?
- How do you release them?
- Is it turned on?
- Is it breathing correctly?
- Are there any leaks?
- Where is the alternate?
- How will you share air?
Mask, snorkel, and fins.
- Are they nearby / on / ready to go?
- (specific to the diving scenario)
Gauges and accessories
- Are wrist-mounted gauges present and correctly configured?
- Knives, cameras, SMBs, slates, noise-making devices, other emergency gear.
- Are they being taken? Where are they stored?
Don’t become complacent. There’s no excuse for skipping the buddy check. You are never too experienced not to make a safety check. It doesn’t take long, and it might just save your life.
Vindicator Scuba Tank Safety Valve / Handle
This device replaces a tank’s valve handle. The handle provides an easy-to-see visual reference that will show if the tank valve is open or closed with a single glance. They’re a great idea for peace of mind.
How To Avoid Losing Your Dive Buddy & What To Do If You Do
Realizing you’re alone underwater can be frightening. In this article, we offer tips on how to reduce the risk of it happening to you as well as what to do if it does.
Whether you’re diving with an operator and as part of a group, or independently with your buddy, your dive plan is your blueprint. An operator will brief the dive, but if it’s you and your buddy, you’ll talk it through.
Navigation is one of the aspects that should be included in a dive plan. If you know where you are going, it’s easier to stay together as you’re less likely to wander accidentally in the wrong direction.
If you’re diving with someone new, it’s a good idea to discuss distance and contact. How far away from each other are you going to dive? Are you going to stay on the same side throughout the dive? What is the anticipated visibility, and how does that affect how you will dive? These parameters try to ensure you maintain contact but also make sure it’s easy to find each other and communicate.
Among the emergency procedures to review is your missing diver protocol.
If you find yourself lost or alone underwater, training agencies recommend that you look around for 1 minute. If you can’t reunite underwater, then you should ascend to the surface and reunite there. You should maintain a safe ascent speed, but you shouldn’t do a safety stop.
Most missing diver situations end happily, but in the instance that something has gone awry, spending 3 minutes making a safety stop could be vital time lost. Remember, it is a safety stop only and not a required decompression stop.
Crucially, when you get to the surface, you stay there. Don’t pop up, look for your buddy, find they’re not there, and go back down again. You could easily miss your buddy doing this, and it’s quite likely that you have drifted from where you lost them.
Stop, Breathe, Think, Act.
The process for handling any situation underwater is: stop, breathe, think, act. This process helps ensure that your reaction is considered, reducing the possibility of panic. If you have discussed and visualized a plan for being alone, it will further aid a smooth reaction.
If you’ve been maintaining contact, your buddy should not be far away and so, looking for them is often successful.
The conditions play a role in your search. In very strong current it might be near to impossible to search, in which case going directly to the surface is your best option.
Lower visibility certainly hampers a search, but the same principals apply no matter how far you can see. Start by looking around you, make a full 360-degree turn, remembering that your buddy could also be above you. If you have no luck, ascend a few meters and make another turn, this time looking for bubbles. Still no luck, then make your best guess as to the direction you think they might be and look there. Remember, if you’re a little shallower, you increase your search area; look for bubbles.
Note: if you’re night diving, turning your torch off or shielding the light helps you see other divers lights.
If you’ve had no luck, it’s time to surface. If you have an SMB and a reel with a long line, you might consider sending it to the surface but fastening it underwater. In case your buddy is missing, this marks the place you missed them, which will be useful in a search effort.
Remember to follow safe surfacing procedures and keep a good lookout for bubbles.
It is possible that it took your buddy a little longer to notice that they’re alone, which means they’re still on the way up. If you’re diving with a group, they might’ve mixed you up with another diver or, in busy locations, another group.
Hopefully, your buddy is on the surface waiting for you, but if not, you need to decide on your next course of action. If you have surface support, signaling them for assistance alerts them to a problem; however, you will need to speak to them to explain the situation.
In an emergency, there are so many variables that it makes it difficult to summarize a response in an article. Are there divers still in the water? Are there fresh divers to initiate a search while emergency services respond? Does the missing diver have a beacon?
It’s at this point that a good emergency action plan is worth its weight in gold. It’s specific to your diving situation and relevant to your location. No matter whether you’re diving with an operator or independently, make sure there is one.
Lost At Sea
Of course, there is another side to this. What if it’s you who is lost? Whether with your buddy or alone, surfacing to find no boat is not great.
If you’re not on your own, fasten yourselves to each other as this ensures that you stay together. Staying together means you form a larger shape which is easier for searchers to see.
If you’re on the surface for a while, not having to kick to stay together will also save your energy. Dropping your weights will help too.
Again, in this situation, there are quite a few variables. The first thing to consider is if the boat has left without you or if you’re not where you’re supposed to be. If you think they have left without you and there is a buoy or marker for where you were diving, stay with it because this is where any search will start.
If you can make it to land, you might want to consider dropping your tank too so that your swim is easier.
If you are drifting or have been swept off the site, you need to do everything you can to make it easy for a search team to find you.
Here are some things that you should consider owning;
Personal locator beacons might seem a bit excessive, but if you are drifting, you’ll be thankful you invested and they cost a lot less than you might imagine. We like the Nautilus because there is no subscription to pay. It works straight out of the box, and it’s very easy to use; push one button to activate the beacon. The Nautilus is robust and rated to 130m / 425ft and is universally compatible. It’s accurate to 1m / 3ft and broadcasts up to 55km / 34 miles.
Storm High Visibility Surface Marker Buoy (more on this below)
This SMB is a 6ft long marker with a reflective strip. Divers heads bobbing on the surface can be quite difficult to spot and keep sight of particularly if the water is choppy. A large SMB will help searchers locate you.
Finger Reels (more detail on this below)
You will need a reel to go with your SMB. Get a long one because, in the case of a missing buddy, you can attach your SMB and reel to the last known location. This gives you an ascent line but also marks the location should a search be required.
Storm Safety Whistle
You can also make noise to attract attention, and if you need help, you want to make as much noise as you can. This whistle is the loudest in the world.
Yes, it’s old school. Yes, you need the sun to shine. But they are extremely effective over distance and might be the thing that catches your rescuers eye. They’re cheap and don’t take up much room. Be sure to practice before you need it.
This product creates a patch of fluorescent green water, making it easier for searchers to locate you.
Follow Established Dive Protocols
- Never hold your breath.
- Don’t dive alone.
- Check your gauges regularly.
- Don’t touch, tease, or chase marine life.
Also, remember that any diver should feel free to end a dive at any time for whatever reason. No questions asked. Having the freedom to do this can prevent a situation leading to panic.
Similarly, if you don’t feel that a dive is for you, don’t do it. There’s no shame, and there shouldn’t be any pressure. Sure, other divers might seek to allay your fears because there might’ve been something you misunderstood. However, it’s your dive to make or not. Never feel obliged.
How To Use A Safety Sausage
A safety sausage is another name for an SMB. SMB stands for surface marker buoy. A surface marker buoy marks your underwater position on the surface so that other water users can determine your location.
No matter what you call it, it’s imperative to your safety. You are at greater risk on or close to the surface than at any other point in your dive. In some locations, you are required to have a marker on the surface for the entire duration of your dive. Check what is required where you dive.
How To Inflate A Surface Marker Buoy?
Using a safety sausage that you inflate underwater and send to the surface is not difficult, but it does take a little practice.
The biggest danger when sending a safety sausage to the surface is that you get tangled with the line and ascend too quickly.
Like all new skills or gear, start in shallow water.
- Make sure that your reel is attached to the SMB but don’t unravel the line.
- Make sure you have control of your buoyancy and if possible, have a visual reference to help.
- If there is current, turn your back to it so that your SMB isn’t pushed into you.
- It’s a bit fiddly, but you need to hold the SMB open and hold the reel with that hand too.
- Use your other hand to take your alternate second stage to squirt some air into the tube. This bit takes a bit of practice for you to understand how much you need. The deeper you are, the less air you need because of expansion but remember, you want it filled well enough so that it will stand full and upright on the surface.
- As soon as you feel the SMB tug away from you; let go. You can use your finger as an axle for your reel, let it spin on your hand, or let it go to spin in front of you. If it does catch and goes up, it will unravel and come down to you.
- You will see some divers fill their SMBs from the exhaust of their primary second stage. There’s nothing wrong with this, but it does bring the SMB and reel closer to you and increase the potential of snagging.
- Once the SMB has reached the surface, you can clip the line off to the reel. As you’re ascending, you can use the clip with to wind the reel up as you ascend. Never clip the reel to yourself; if overhead traffic should catch the SMB, you want to be able to let it go.
- Once you are at the surface, don’t deflate your SMB until you’re at the shore or boat.
Which SMB To Choose?
The Two Versions Of SMB
As the name might suggest, an SMB is sausage-shaped.
- The simplest versions are sock-like; sealed on the top and along the sides but open at one end so that you can inflate it. These are not ideal. When they arrive at the surface, they can fall over and spill the air. They deflate and won’t be visible. This type is often made of poorer quality materials and is not durable.
- To stop spillage, the better versions have a one-way valve instead of an open end. These SMBs will have an over-pressure release and dump valve to save it from exploding and to enable you to deflate it.
Two Colours Of SMB’s
Orange is the most common color but you will see yellow versions.
- Typically, yellow SMBs are used to signify something different, i.e. a diver needs gas or assistance or whatever might’ve been agreed before the dive. This protocol is only usual on dives involving decompression.
- Some SMBs have one side yellow and one orange. There is debate as to which color stands out best. Having both colors on one safety sausage means you get the best of both worlds. However, if surface support is watching an orange SMB, it’s confusing if it rotates and becomes yellow.
Our advice would be to stick to orange.
Is The Size Of SMB Important?
Safety sausages come in different sizes. It’s advisable to get a large one because you want to ensure it can be seen in choppy conditions.
Our recommendation would be 6ft tall.
It’s ideal if your SMB has;
- a clip or method of storage for easy carrying,
- a reflective strip to increase visibility particularly at night,
- an oral inflation pipe which allows you to top the SMB up once you’re on the surface.
Our Choice Of SMB
Storm High Visibility Surface Marker Buoy
This SMB is bright orange and 6ft long. It has a one-way and oral inflation valve for filling. There’s a clip for storage and a band onto which you can attach a reel. The overpressure release and dump valve are robust and easy to use. At the top of the buoy is a reflective strip.
To make sure your keep hold of your SMB and that it stays above you to mark your position, you need to attach it to a reel. An SMB will have a loop or ring to which you can attach a reel.
The best type of reels are the simplest with no working parts that can jam. A finger reel is a simple spool which will spin on your finger, or if you let it go, in the water where you released it. They’re easy to use with gloves on and small enough to carry without getting in the way.
Finger reels have holes in the spool’s outer so that you can clip off the line.
It’s important to choose a reel with a decent length. It’s good practice to send it up before your safety stop so you’ll want more than 5m / 15ft of line. Remember too that if there’s current, waves, wind or if you want to tow it for the dive; you don’t want to have problems due to the length of your line. A 30m / 100ft line might seem a bit excessive, but it’s the popular choice.
Our Choice Of Reels
This reel is 30m / 100ft and is a great choice. Its color makes the line easily visible, and it comes with a double-ended clip.
How To Reduce Your Risk Of Decompression Sickness
When you learn to dive, you’re taught how to make a dive plan that keeps you within no-decompression limits. You’ll learn to use a dive table and a dive computer. These tools do not monitor anything in your body; they’re based on an algorithm. This means that even when you plan your dive within established limits, you’re still putting yourself at some risk. There are steps that you can take to reduce your risk of getting the bends scuba diving.
Dehydration is a significant factor in cases of decompression sickness. If you’re not hydrated your circulation system is sluggish. Sluggish circulation will not expel nitrogen optimally. It’s easy to get dehydrated after a long flight or when diving in hot weather, so make sure you’re drinking enough water. Remember caffeinated drinks and alcohol are diuretics, which dehydrate you further.
Never dive to the limits of what the table or your dive computer advises. Build-in some conservatism; this is particularly important in cold conditions or for dives where you might be working harder than a simple reef tour. Making multiple dives a day on consecutive days also requires conservatism.
Have A Smooth Profile
Dive tables and computer algorithms were created and tested on the basis that you descend to your deepest point and then gradually ascend. Sawtooth profiles, where you ascend and descend repeatedly, are not recommended because they fall outside of what has been tested.
Recommendations for ascent speeds vary between 9 m and 18 m per minute. Take it slowly. Your computer likely has the slowest speed setting, don’t exceed it.
Make A Safety Stop
A safety stop is a pause for 3 minutes at 5 m. Between 10 m and the surface is where the biggest pressure change occurs. Stopping in the middle of this range allows your body a little extra time to get rid of nitrogen before you make your final ascent to the surface.
It’s not mandatory; it’s not a decompression stop which means in an emergency you can skip it. Unless it is an emergency, do it.
Drugs And Alcohol
It’s inadvisable to dive under the influence, and this includes any residual effects from the night before. Alcohol dehydrates you too, so you need to be prudent with your consumption the night before. If you’re taking prescription medicine, check with your doctor before diving.
Exercise changes your circulation. For this reason, it’s advisable to refrain from vigorous exercise pre or post diving.
Be Fit And Healthy
You need to be in good condition to eliminate nitrogen effectively; being overweight or unfit has an impact on your circulation.
Flying After Diving
Flying too soon after diving puts you at risk of decompression sickness. Unless you’re diving at altitude, dive tables and computers work on the basis that after your dive you will return to sea level.
When you fly the pressure surrounding you is less than sea level. Reducing pressure allows dissolved nitrogen in your tissues to come out of solution. If you reduce the pressure surrounding you too quickly, nitrogen bubbles form in your tissues, which can cause decompression sickness.
Upon surfacing from any dive you will still have nitrogen dissolved in your tissues. Dive agencies and dive medical advice recommend that you wait for this residual nitrogen to leave your tissues before flying.
Dive computers will calculate your no-fly time, but the accepted guidance is;
- wait 12 hours if you have made a single no-decompression dive,
- wait 24 hours after repetitive, multiday, or decompression diving
- At altitude, the pressure is less than at sea level, and the protocols are a little different.
Take training to dive at altitude safely.
Note that your airline may also have guidance and refuse to let you fly if you do not meet their requirements. Further, it’s likely that your insurance would not cover you for hyperbaric treatment should you fly contrary to recommendations.
Diving after flying is not the same, but it does carry some risk that you need to assess. Short flights are not usually a problem, but long-haul flights can leave you tired and dehydrated. It’s advisable to take some time upon arrival to rehydrate and rest. The medical community recommends 12 hours but state that 24 hours would be better.
Stay Fit & Healthy
You have a responsibility to yourself and your fellow divers to be fit enough to dive.
Being sick, unfit, or overweight puts you at increased risk of decompression sickness but also has other risks.
If you don’t have the strength or stamina to deal with an extended surface swim or current or assist your buddy in these conditions, then you could put your dive team at risk.
Note that some locations require a dive medical verified by a doctor before they will allow you to dive regardless of whether you have any of the conditions listed on the RSTC medical statement.
Keep Your Gear In Good Working Order
“Look after your gear, and it will look after you.” It’s a well-used cliché, but it’s true.
Your BCD and regulator should be serviced to make sure they’re in good working order.
Every other piece of gear should be inspected too.
- Check your mask’s strap and skirt.
- Your fins need to be checked for cracks along the blade. The straps should be checked for cracks, tears, and perishing. Are the buckles damaged?
- Check zips and seams on wetsuits and seals and zips on dry suits.
- Check your weight system. What you check will depend on what you use but look for wear.
- For wrist-mounted gauges, check the straps and, where applicable, the batteries.
- If you’re carrying a slate, check the pencil works.
- Verify that any other accessories are in good working order too.
Gear does fail, so putting together a relevant assortment of spares and carrying them with you is a good idea. That way you won’t miss a dive because your fin strap broke.
Our Recommended Dive Safety Kits
XS Scuba Save A Dive Kit
Carry spares of those items that could break and you won’t have to sit a dive out if they do. This kit has a mouthpiece, cable tie, fin strap, mask strap, O-rings, snorkel retainer, weight keeper.
Innovative Scuba Concepts Deluxe Diver Tool & Repair Kit
This kit includes a simple selection of the tools required to help make simple repairs. Apart from the tools specially selected for scuba gear repairs, there’s silicone grease, O-rings, and cable ties.
Carry The Right Gear
Standard Scuba Diving Kit includes
- Weight System
- Exposure Protection (wetsuit)
Prudent Additions To Your Standard Dive Kit
- Dive knife
- A way of attracting attention on the surface and underwater
- Surface marker buoy and reel
- A Timer or dive computer
- Spare mask
Other activities may require specific kit, as an example, for a night dive you need a torch and a backup. Make sure you have what you need for the dive that you are planning.
Refresh and Maintain Skills
When you learn to dive, you’re taught a variety of skills and techniques. Some of the skills you learn are put into practice on every dive. There are other techniques that you’re taught that, hopefully, you will never have to use. These self-rescue skills don’t become important until you need them. If the last time you practiced them was when you learned them, they’re not going to be fluid. It’s possible that you might not even remember what they are and how to do them.
The standard advice is that if you have not dived for longer then six months that you should take a refresher. The refresher will run you through all the skills you learned during your entry-level course. However, if you dive regularly, there’s no recommendation about doing a refresher. This means that your self-rescue skills could become rusty.
What Should You Practice Regularly On A Dive?
- Regulator recovery and clearing
- Out of air scenarios
- Mask removal and replacement
- Cramp removal
- Towing a diver
- Removing and replacing your gear on the surface and underwater
- Breathing from a free-flowing regulator
- Response to accidental weight loss
- Response to malfunctioning LPI
Practice should take place in a calm, shallow, and controlled environment.
It’s not just the basics that you need to refresh. If you’ve trained in rescue techniques or other specific skills, practice them so that you can call on them when needed.
Emergency Action Plan
Knowing what to do in an emergency is crucial to a fast response. The more efficient your response is, the more likely is a better outcome. A plan should be clear, easy to follow, and readily available. It should include;
- Emergency contact information including method of contact
- Radio frequencies
- Phone numbers
- Landline / mobile / satellite
- Process for handling emergencies, specific to the dive location
- Guidelines for recording key information to assist rescue and medical teams
- Location of first aid equipment
- Details of how to direct emergency services to your location
- Location of the closest medical facility
- Relevant qualifications of the dive team
First Aid Kit And Emergency Oxygen
There should always be a first aid kit and emergency oxygen available when diving. These items are key to providing initial care. If they’re not available, you’re putting yourself at risk.
When suspected decompression sickness is treated immediately by giving the diver emergency oxygen to breath, the subsequent hyperbaric treatment requirement is reduced.
The Trident Kit first aid is ready-made and comes in a hard-waterproof box.
Wound Care(1) 5″x9″ Abdominal Pad(8) 1″x3″ Woven Adhesive Bandage(4) Butterfly Adhesive Bandage(1) 2″ Gauze Bandage(6) 3″x3″ Gauze Pad(2) 2″x3″ Gauze Pad(1) “x10yd Cloth Tape Triangular Bandage Skin Preparations(4) Alcohol Prep(4) BZK Towelette(1) Burn Free Gel(2) 1% Hydrocortisone Cream(2) Sting Relief Wipe(2) Triple Antibiotic Ointment Instruments(1) 3-1/2” Stainless Steel Forceps(1) Pair Large Nitrile Gloves
Training And Qualifications
To be better prepared to deal with an emergency, you can take training. Whether it’s BSAC or PADI, or any other dive agency, they’ll have a course designed to help you;
- spot problems before they happen,
- learn and practice skills that will enable you to respond to emergency scenarios,
- plan for, respond to and manage emergency scenarios.
Apart from in-water skills, having first aid and an oxygen provider qualification will give you the skills and the confidence to offer assistance to an injured diver.
However, it’s not just about your ability and qualifications. If you’re diving with a group, no single person needs to do everything. Great emergency management means delegation. To assign roles effectively, you need to know what everyone is qualified for and comfortable with. Even new divers can have a role recording data or watching the surface. If you spend some time to consider each diver’s capabilities before you dive, you’re prepared should any response be required.
Hyperbaric treatment and evacuation cost money. Most locations and operators will not let you dive without dive insurance. Regardless you’re putting yourself at risk if you don’t have insurance as it can slow response and leave you with a huge bill.
Potential scenarios could range from a reverse block to a missing buddy. If you have thought through what you would do, it will make your response calm and measured should you need it.
Having a dry run in your mind allows you to weigh up your options without pressure. Ask fellow divers too as this will spark more debate and provide solutions that you haven’t thought of.