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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26
votes
1answer
3k 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? ...
16
votes
5answers
1k 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 ...
11
votes
2answers
467 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 ...
11
votes
1answer
84 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 wetsuits. The next thickest I think is actually a drysuit for really cold waters, but not sure if there is a ...
10
votes
1answer
207 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 ...
10
votes
2answers
107 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 ...
9
votes
2answers
192 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. ...
9
votes
2answers
1k 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 ...
9
votes
2answers
81 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 ...
8
votes
2answers
140 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 ...
8
votes
3answers
154 views

If my depth varies +- 2m when breathing in and out, what's gone 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 ...
8
votes
1answer
58 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 ...
7
votes
3answers
635 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 ...
7
votes
2answers
84 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 ...
7
votes
2answers
118 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 ...
7
votes
1answer
78 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 ...
5
votes
2answers
778 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 ...
5
votes
3answers
290 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 ...
4
votes
1answer
56 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 ...