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Will try socks or duct tape on the next dive trip. Thanks!

As the title says, that's what happened on the last dive trip. The rear of the booties rubbed off the uppermost layer of skin behind my ankle. Anyone have a solution?

A trimix diver ran out of gas on the bottom. He was in deep trouble.

I finally was able to just manage 20 metres at the pool without hyperventilation. For some strange reason, I could only do it without goggles.

@hakachukai: My country is technically third world, but weight belts and weights are available; I'm just unable to get them as of now. My diaphragm contractions are the active type. @Hank49: At the moment I'm trying to improve my endurance by swimming laps, but I'm going to try for depth on the...

It's staying down longer. About 10 m into my 20 m swim, my diaphragm reflexively (annoyingly) starts to try and squash the air out of my lungs. I don't have access to a weight belt, so I'm also wasting energy counteracting my positive buoyancy.

If donating the primary is a problem, the alternate air source could be donated instead.

Perhaps instead of writing "Difficulty with AAS", it should be "Difficulty with switching to bailout regulator".

If you're not equalizing, the valsalva (I think that's how you spell it) technique works for shallow freediving. Simply pinch your nose and exhale (well, try to), but do not let the air out. This should force air into your ears. If you have heard a cracking sound and feel pressure in your ears...

From what I have seen on this thread, the disadvantages of a FFM are: - Possible difficulty with gas switching - Difficulty with the AAS in an OOA situation - Difficulty with inflating the SMB - Larger dead air space - problematic for rebreather divers - Flooding in an OOA situation

However, ignoring the plight of Dave Shaw, what about the reasons that a full face mask shouldn't be used for (recreational) technical diving, besides gas switching and difficulty with inflating the SMB?

Hamlet.

I would, if I had the funds and time. Maybe contact some experts as well.

I heard that Dave Shaw died because he was working too hard at depth, and because he wasn't getting enough oxygen, he blacked out and eventually died by drowning; apparently he would've survived if he had called the dive. However, that's not my only premise; just an example. I thought it might...

Just curious. I was thinking that a full face mask would have saved Dave Shaw or many other people from drowning. Is it because the mask makes regulator switching troublesome?

@Hank49: Yes, I inhale abdominally first then my chest, but I've never heard about looking up for that one last breath. The thing is that if I do that on land, my lungs feel fuller than if I did that in the pool. @supergaijin: Awesome video. I can't believe how people do that.

I tried inhaling slower and getting my heart rate down, and it helped a bit, but buoyancy was a problem. However, I feel that I'm not filling my lungs to the capacity in the pool than I can on land.

I'll try your advice the next time I get to the pool.

What about a weight belt?