10 Common Diving Mistakes (and How to Avoid Them)
As an instructor, I see the same mistakes come up dive after dive. No judgement , we've all been there. What matters is spotting them so you can improve. Here are the 10 most common diving mistakes and practical fixes for each one.
1. Why should you equalize early when diving?
This is the number one classic. Many divers wait until they feel pain before equalizing the pressure in their ears. By then, the Eustachian tubes are already compressed and equalization becomes difficult or even impossible.
The fix: start equalizing at the surface, then every few seconds during your descent. If it doesn't work, go up a metre and try again gently. Never force it.
2. Why should you never skip the buddy check?
You know your gear, you checked it at home, so you skip the pre-dive buddy check. Bad idea. A disconnected inflator, a closed valve or a loose weight belt can happen to the most experienced divers.
The fix: do your buddy check every single time. Use a mnemonic (BWRAF: BCD, Weights, Releases, Air, Final check) and make it a habit. It takes 60 seconds and can prevent a serious problem.
3. How do you improve buoyancy control when diving?
Too many divers spend their dive constantly inflating and deflating their BCD, bouncing between the bottom and the surface. Poor buoyancy damages reefs, increases air consumption and causes unnecessary fatigue.
The fix: work on your buoyancy every dive. Your breathing is the main tool: inhale to rise slightly, exhale to descend. The Advanced Open Water course includes a dedicated buoyancy dive , it's a game changer.
4. What happens if you ascend too fast while diving?
The nitrogen dissolved in your tissues needs time to off-gas. Ascending too quickly risks decompression sickness. Even on shallow dives, a rapid ascent can cause problems.
The fix: respect the maximum ascent rate of 9 metres per minute. Follow your smallest bubbles , they shouldn't rise faster than you. And always do your 3-minute safety stop at 5 metres.
5. How do you manage air consumption when diving?
Ending up at 30 bar on the bottom without realising it doesn't just happen to other people. Air management is a fundamental skill that some divers neglect once their training is done.
The fix: check your gauge regularly, ideally every 5 minutes. Communicate your pressure to your buddy. Plan your ascent with enough reserve (50 bar minimum).
6. Why should you never touch marine life?
It's tempting, especially when a turtle glides past or a colourful nudibranch catches your eye. But touching marine organisms can injure them, cause stress, or destroy entire colonies (corals take years to grow just a few centimetres).
The fix: look with your eyes. Keep your hands close to your body or crossed in front of you. The best underwater photo is one taken from a respectful distance.
7. How do you know if you are properly weighted for diving?
Too much lead and you're kicking like crazy to stay off the bottom. Not enough and your safety stop becomes a battle. Incorrect weighting is the root cause of most buoyancy issues.
The fix: do a weight check at the start of your dive. On the surface with an empty BCD, you should float at eye level while breathing normally. At the end of your dive (tank nearly empty), you should be able to hold your safety stop effortlessly.
8. How do you maintain your diving gear properly?
A free-flowing regulator, a computer with a low battery, a wetsuit leaking through a worn zip... Poorly maintained equipment means unnecessary stress and avoidable risks.
The fix: rinse your gear in fresh water after every dive. Have your regulator serviced annually. Check your o-rings and batteries before each outing. Good maintenance extends the life of your equipment and keeps you safe.
9. Why should you never dive beyond your certification?
Following a more experienced buddy into a cave, dropping to 35 metres with an Open Water certification, attempting a night dive without training... The temptation is real, but so are the risks.
The fix: respect the limits of your certification. If you want to go further, get trained. The Rescue Diver course builds your risk awareness and safety reflexes. Each level opens new doors , take them in order.
10. Why do you always need a dive plan?
"Let's just go down, see what's there, and come back up." That's not a dive plan. Without planning, you lose track of time, depth and air. That's when problems start to stack up.
The fix: before every dive, agree with your buddy on maximum depth, duration, route and signals. Set a turn pressure. A simple plan is enough, but you need one.
The bottom line
None of these mistakes is serious on its own , as long as you correct them. Diving is a sport that improves with experience and humility. Every dive is a chance to learn something new.
If you recognise some of these mistakes in yourself, that's already a great sign: you're aware, and that's the first step. Want to improve? Let's talk about it , we'll find the course that takes you to the next level.