Questions tagged [scuba-diving]

Questions relating to any thing related to scuba diving. Examples include, but are not limited to; diving gear, diving physics, diving injuries, dive sites, diver training, recreational diving, technical diving, etc.

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Heliox saturation diving excursions nitrogen levels in Breathing gas medium

The main question is on of effect of changing the composition of breathing gas mixture. When breathing a mixture 10% Oxygen 8% nitrogen and 82% Helium at saturated levels, will there be an effect if ...
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2 votes
2 answers
151 views

Minimum operating depth for lean SCUBA gas

when doing deep decompression SCUBA diving where a travel gas is used I am curious how to calculate the minimum operating gas for a lean O2 mixture (like 10%). Obviously the maximum is calculated by ...
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7 votes
3 answers
779 views

Using mini scuba sets: 1L-3L tanks

Are the mini scuba sets (e.g like the ones by Smaco, with tanks of a few liters that are filled using a hand pump) safe for open water diving up to a depth of around 10m? I have no experience in ...
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0 votes
2 answers
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How can divers be sure that there are no sharks or other lethal water animals where they dive?

I've always been scared of sharks. It seems like the most natural thing in the world to be afraid of. I instinctively haven't forgotten what it was like for my ancestors to swim around in that big, ...
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4 votes
2 answers
245 views

Can you see further when diving with a flashlight in cloudy water?

Yesterday I've lost my diving mask when I jumped into a gravel pond. The diving mask is yellow and easy to see, but I immediately lost sight of it because the water is / was very cloudy and it sunk ...
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3 votes
1 answer
148 views

How to get out of thicker wetsuits efficiently and quickly?

I've always had a problem getting out of thicker wetsuits (4/3 mm and above, chestzip with/without hoodies). I would like advice from anyone who has tips getting out of these types of thick wetsuits (...
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4 votes
1 answer
328 views

How can I tell if there's a camouflaged octopus in a coral reef, so I can keep from disturbing it?

This question is based on my desire to avoid disturbing, injuring, or scaring away an octopus which is camouflaged to look like a coral reef. Since it's so difficult to see, I'd like to know how to ...
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4 votes
2 answers
279 views

Where in the world do you need a cave diving certification to dive?

Firstly a preface: all training's good and especially overhead training where the environment's so unforgiving. Plus lots of practice. Where around the world are dive locations where you must have ...
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7 votes
2 answers
300 views

Is there anywhere to dive in the Mediterranean that's like the Red Sea?

Have heard great things about diving in the Red Sea. However, Egypt's not the most stable and safe place to visit. What are the alternative locations for diving in the European side of the ...
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  • 1,076
6 votes
3 answers
27k views

Why didn’t diver Yuri Lipski inflate his buoyancy control device?

I saw the footage of the fatal diving accident of Yuri Lipski. One thing I wonder is what really happened. He doesn’t seem to try to inflate his Buoyancy Control Device (BCD) to get back up. Did he ...
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9 votes
3 answers
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No Stop Limit for Recreational Scuba Diving

No decompression diving (No stop diving) refers to "diving that you can always ascend directly to the surface without stopping, yet without significant risk of decompression sickness" (according to ...
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Can I reuse the PADI Scuba Diving e-training for another person?

My brother and I are planning to get PADI, (Professional Association of Diving Instructors), certified. The e-learning course in July, 2018 is $180, which isn't super cheap. Can I buy one and re-use ...
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15 votes
3 answers
641 views

What are possible ways to drink on a long scuba dive?

On longer dives, let's say over an hour long, the air from the cylinder becomes rather dry and can cause a dry throat - what are possible ways to have a drink when scuba diving? Are there alternatives ...
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6 votes
1 answer
199 views

Where are good dive sites to scuba dive with seahorses?

In a couple of weeks my buddy (husband) and I will be doing a few dives on the UK's Jurassic coastline, in Swanage. It's said if the vis (visibility) is good here you can often see seahorses, as they ...
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5 votes
1 answer
299 views

What are good dive sites to scuba dive with cuttlefish?

My husband and I scuba dive together often, and he really wants to get the chance to scuba dive with cuttlefish (and why not they are super cute!). This can involve night diving. What dive sites are ...
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5 votes
4 answers
244 views

Scuba diving right after passing certification

I'm looking to go scuba diving at the Great Barrier Reef next year. I've not yet been certified, but I plan to do it soon. If my only scuba experience is the certification course, do I need to worry ...
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11 votes
5 answers
892 views

How to avoid getting cold when diving?

I've done a few scuba dives and really enjoy it, except (diving or not) I get cold quickly when submerged. I have very low body fat and relatively low blood pressure (though I am healthy overall) so ...
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13 votes
1 answer
770 views

Lead shot vs Lead block weights

When scuba diving I use a weight belt for my weight system - my BCD does have an integrated weight system, but I am still working on my weight distribution for trim, and total amount for buoyancy. My ...
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6 votes
2 answers
174 views

What part of the world has the largest variety of corals?

I'm fascinated by corals. I've been told there are more than a thousand varieties spread out in bodies of water throughout the world. What part of the world has the most varieties of corals in a ...
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9 votes
3 answers
643 views

What are the pros and cons of both a DIN and a yoke valve for a scuba-diving regulator?

I'm looking at buying regulators for scuba-diving this weekend and we came across the options to have a DIN or a yoke valve for our first stage. What are the pros and cons of both a DIN and a yoke ...
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12 votes
1 answer
2k views

Is it worth getting a divemaster certification if I don't plan to work as a professional dive master?

I have been an avid diver for over a decade. Once upon a time, I wanted to get my divemaster certification in order to work (for a short time) as a divemaster. However, that ship has since sailed, but ...
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9 votes
4 answers
270 views

What should I look for in a used wet suit?

I am considering getting a used wet suit for sailing and canoeing in the early spring and next fall. What should I look for? Based on the related Q&A below, it looks like I will want 6-7mm (1/4 ...
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11 votes
3 answers
364 views

Special equipment for Nitrox Dive?

Is there any special equipment needed for diving with Nitrox(more than 21% O2)? In Germany there are regulations and laws that say that you can only dive using Nitrox if you have this special ...
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12 votes
2 answers
520 views

Does a diver's breath rate become slower when going deeper?

When a diver goes deeper, the air goes into the lung is compressed, compared to the state of air at sea-level ground. Accordingly, the oxygen partial pressure is higher than the ground. If a diver ...
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  • 221
9 votes
6 answers
2k views

How to dry a BCD (Buoyancy Control Device)

Out of all my dive gear, the item that is the hardest to dry is the BCD. If the weather is nice then it is not an issue, just put it outside. The issue is drying my BCD when the weather is rather ...
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  • 3,175
6 votes
2 answers
421 views

How should latex socks be fitted to a drysuit?

I've picked up a surplus used aircrew Beaufort Mk 10 Immersion Suit (for aviation use, but I think there's more likely knowledge among watersports enthusiasts). It needs latex socks adding to the ...
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  • 161
12 votes
1 answer
675 views

Cold water regulators and warm waters

For diving in the UK in colder weather the water temperature can easily be below 10C. Warm water regulators seem to be 10C +, and then cold water regulators for below that as they need to be able to ...
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8 votes
1 answer
255 views

How to scuba dive safely in waters that have Great White Sharks?

This is something I have been thinking about since answering this question about guessing the size of a shark. What precautions would a scuba diver take or is this something that is simply avoided?
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8 votes
1 answer
4k views

Can I guess the size of a shark by the size of its dorsal fin?

Is there a relative scale to which one can estimate the size of a shark by looking at its dorsal fin? I know it will differ from species to species, but is there a general guideline maybe for each? ...
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10 votes
5 answers
7k views

When taking a Go Pro scuba diving, how would you mount it?

I'm taking a Go Pro to shoot some diving video, and I've never done this before. Assuming a mask mount is not an option, would you strap it to your wrist, attach it to your BC, or take it loose / on a ...
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  • 539
9 votes
3 answers
191 views

How can I stop my scuba mask from pulling away from my face after equalizing?

I'm having what seems to be an unusual problem. After equalizing, it seems like my mask is filling with air and starts to pull away from my face and fill with water. I can press it back on my face and ...
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  • 539
30 votes
2 answers
10k views

Will a compass work underground or underwater?

Because they rely on radio signals, GPS units generally do not work underground or underwater, but what about a plain ol' magnetic compass? Are the magnetic fields of earth present at all depths? ...
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  • 700
13 votes
3 answers
466 views

How to transport diving knives / shears?

If I am required to transport my diving equipment (in the UK and Abroad) what are the best practices of transporting my diving knife / shears? If on a plane this can just go in the hold luggage same ...
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16 votes
2 answers
2k views

What wetsuit thickness is recommended in which temperatures for diving?

I'm soon to embark on a chilly scuba dive around 5-7C at 18m, of which we'll be wearing 7mm semi-drys with shorties. The next thickest I think is actually a drysuit for really cold waters, but not ...
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9 votes
2 answers
1k views

How do PADI and SSI qualifications match up?

In a similar manner to this question: When describing my PADI qualifications with a CMAS diver, is there a well know equivalence table? How do the PADI qualifications match up to the SSI ones? Is ...
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17 votes
5 answers
3k views

Diving mask colouring

I'm learning to dive and the first purchase is a mask and snorkel. The issue I have is discerning what mask to get colour-wise. There seem to be two main types for the silicon, clear and black. The ...
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  • 3,175
10 votes
2 answers
750 views

What locations to scuba dive inland in the UK?

My husband and I are learning to Scuba dive this year with a friend. We're doing the SSI courses, which require a large number of dives to progress through each qualification. Open Water through to ...
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  • 15.4k
10 votes
3 answers
191 views

I've been out of the water for a little over a year; what should I focus on refreshing before I dive again?

I've been scuba diving for several years, but it's been a little while now since the last time. I last dove in the summer of 2014, and I'm traveling to Chile next month and am hoping to go diving ...
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  • 203
10 votes
4 answers
5k views

How many lumens for a diving torch?

Title says it all really. I am looking to buy a diving torch as I am taking up diving next year. What am I looking for? They seem to range from 100lm to 2500lm. Realistically how many lumens are ...
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  • 3,175
9 votes
3 answers
507 views

What will the water temperature be at Sharm el-Sheikh at a depth of 30m in October?

You can easily find the temperatures at the surface of the sea. However, to choose the correct diving suit, I would like to know the temperatures that can be expected at a depth of about 30 meters (...
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  • 271
5 votes
1 answer
142 views

Where to get the DOS version of "DataTalk" (for Aladin diving computers)?

In order to configure my Aladin diving computer, I built the interface as described here. The software "DataTalk" can be used to configure the diving computer. However, the Windows version (which can ...
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  • 271
13 votes
5 answers
573 views

If my depth varies +- 2m when breathing in and out, what's going wrong?

This week, when diving mostly with people more experienced than myself, I noticed something about my buoyancy compared to theirs. I'm wondering how to fix it. Before setting off, we all selected what ...
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8 votes
3 answers
2k views

Does "dive your deepest dive first" still apply when using a computer?

When doing my PADI open water course, including all the stuff around pressure groups and calculating maximum depth times by hand, I was told that I should always do my deepest dive first, and go ...
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  • 1,139
12 votes
1 answer
444 views

Is this "dry suit cutting wrists" story realistic?

I'm reading a very good novel, called "Smilla's sense of snow". A minor figure tells this story from the time he was a frogman with the marines: Going down, I glide through a cold belt [...] I ...
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  • 1,512
9 votes
2 answers
340 views

What to look for in a snorkel?

I recently read over this post: What to consider when buying fins for recreational snorkeling and found some great advice in what to look for when purchasing fins for snorkelling. However I was ...
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10 votes
2 answers
341 views

Surfacing rapidly after a Scuba Dive

I recently had my first scuba dive. And the other instructor here was referring to something that is related to air Embolism as I overheard, that one should not surface too rapidly after a deep dive. ...
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10 votes
2 answers
3k views

When describing my PADI qualifications with a CMAS diver, is there a well know equivalence table?

I'm currently in a French overseas territory, and almost all of the dive centres and clubs here use the CMAS system. Whenever I've booked in for a dive, the dive centre has looked at my PADI ...
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  • 1,139
5 votes
2 answers
3k views

During a safety stop, how do I avoid my feet floating up?

On my last couple of dives, I've noticed that my feet tend to float up during the 5m / 3 minute safety stop. It seems to be more of an issue when doing a safety stop using a line to ascend, but I've ...
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  • 1,139
14 votes
4 answers
2k views

What exercises can you do before Scuba Diving to improve your air consumption?

It has been a number of months since I last went scuba diving - short enough that I can still remember everything, but long enough for any diving specific exercise related things to have worn off. If ...
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  • 1,139
12 votes
3 answers
806 views

Eating in a long sport activity (scuba diving) to keep your strength up

We're planning a 9 to 10 hour dive. We can't go that long without eating. What kind of 'food' could replace at least 2 meals of the day so we can 'survive' a long dive like that? We'll figure out if ...
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