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I feel like my sidemount bc tries to push me face down in the water on the surface (dry suit with two heavy steel tanks). Didn't have that problem in backmount.

ANDI : ANDI Ascent and Descent Procedures | Diving Techniques

Accidentally diving with a closed isolator valve: diver runs suddenly OOA. Sure it's recoverable by switching the reg, but that's not what comes to your mind as a solution right away if you have no experience with doubles.

I'm currently also looking for INON strobes for my RX100M3 in Isotta housing. I guess two S2000 will be better for me than a single Z330 (correct me if wrong). Their energy output will be smaller (2xGN20 is less than GN33), but with two strobes I can move them farther outside for WA, this...

1) Don't overexert yourself under water. Tell them at the surface that you didn't feel safe with them, their behavior is irresponsible and unacceptable particularly when diving with a new diver. 2) become better at swimming under water; that means good horizontal trim (to minimize drag) and...

Do you know this book https://www.amazon.com/Diving-Body-Emotions-Monika-Rahimi/dp/1847480713 ? the German version is popular, how to overcome stress and anxiety for divers.

The ascent rule was: as long as (p_tissue_N2 - p_inspired_N2) + (p_tissue_He - p_inspired_He) > 1.25 bar for any tissue, the current off-gassing gradient is considered sufficient. Ascend to the ceiling if every tissue's off-gassing gradient is <1.25bar or if ascending to the ceiling allows...

I found something interesting playing with these delayed ascents: EAN80 is actually a useful decompression gas and EAN40+EAN80 can be better than EAN50+oxygen, but only if you use EAN80 to shift decompression time from 3m to 9m, like this: depth stop run gas...

This discussion is focused too exclusively on equipment and configuration for my taste. As long as you do NDL dives shallower than 25m, equipment failure need not be your main concern. The main risk of your solo diving won't be equipment failure, but human body failure, i.e. medical issues. Say...

Your descent rates are different. MD spends 17m16s on the bottom, TD 19m0s (+10%). Setting same descent rate reduces TTS by 3min in TD. Rounding seems to be different. From 3m to 0m, MD rounds 20s down to 0; TD rounds it up to 1min. Makes another minute difference. Maybe MD calculates descent...

It'd take only 49min and not be comparable to the others. Anyway, this example was air to 50m and even there the effect is small. It just proves that "follow the ceiling" is not optimal even for air+EAN50. But I agree that if you don't dive deep on air and 70ft is more than half your depth, then...

Here I tried again, with an air dive for 20min to 50m (164ft) with EAN50 deco from 21m (70ft): Three ascents of same runtime, with GF20/80, GF50/70, and GF77/77X (staying at 21m on EAN50 until the 9m ceiling clears): GF20/80: depth stop run gas...

Could it be that it's just cheaper if the instructor teaches ITT+AN/DP but issues only the AN/DP card, so you save the ITT certification fee as you won't need that card anyway. So formally you sign up only for AN/DP class; the duration, number of dives and course price depends on the diver's...

The switch from 18/45 to EAN50 is most obvious as inspired He drops to zero and getting rid of He in medium-fast compartments is your main concern at that moment. But also on an air+EAN50 dive, the inspired N2 drops instantaneously from 79% to 50% , hence your trade-off between "get shallow to...

I don't like the third video. He moves the knees up and down again, will silt out when close to the bottom. Nice gliding phase though.

not an instructor either, but also a remark: Speed of movement should be fast when pushing the water backwards, but slow when retracting the ankles forward. During the kick phase, your ankles should move backwards only. There may be a short gliding phase before pulling the ankles forward slowly...

According to Wikipedia, "Efficiency is the (often measurable) ability to avoid wasting materials, energy, efforts, money, and time in doing something or in producing a desired result. In a more general sense, it is the ability to do things well, successfully, and without waste." "Without waste"...

The national regulations of CMAS member organizations seem to be quite different here. In German VDST, there is the 40m limit. No 60m air dives for CMAS*** here, you get certified for 40m (and that's the limit during training too). For deeper dives, take tec basic class, and Trimix*...

This example used this rule: compare the off-gassing gradient (p_tissue - p_inspired) at the current depth with the gradient at the ceiling, for every compartment and for every inert gas (N2 and He). If there's any compartment and inert gas that has less than 0.5bar off-gassing gradient at...

IIRC Mark Powell writes in Deco for Divers that the term "oxygen window" is used inconsistently in the community. The only actual effect of oxygen to speed up decompression is, that it reduces the amount of inert gases (N2, He) in the inspired gas. Whereas the other idea, that the pPO2...