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Military rebreathers (Drager, OMG, SIEL) all employ chest mounted counterlungs. I used some of them, and found them very easy to breath once the diver gets the proper technique. Yes, the average pressure is always positive, which is healthy, as the muscles for expelling air are much stronger...

The colon (":") was missing in the URL. here the correct one: https://1yachtua.com/diving/

There are two factors affecting longevity of a regulator: 1) materials employed 2) availability of spare parts 1) affects particularly "modern" second stages made of plastic or other compounds. Some of them become brittle and fragile after just 10 years, some others (Scubapro G250 Graphite, for...

If the deep dives are not exceeding 40m and well within NDL (reaching your safety stop with at least 5 minutes before hitting NDL), and you can use a proper Nitrox mixture also for them, at that point these are all "normal" recreational dives, they should not be classified anymore as "deep". So...

I second what others already said: a full single piece, stretchy 3mm, with additional separate hood for when needed (not needed most of the time). And a good computer, very important is a good display which you can read easily. I like to have my own fins and mask, which are perfectly suited to...

CMAS clubs here in Italy, in several towns, offer pool activity (acquaticity courses) starting at 6 months. We did bring our children to a club named Sesto Continente, in Reggio Emilia, starting at 8 months. They had a special instructor, named Roberta, who was enabled to train parent-son...

In France there are strict laws. In practice only divers with CMAS-compliant certifications are free to dive alone, without supervision.

11 y.o is probably the most wrong age. You either start much earlier (my sons both started in the pool with their small tank at 2.5 y.old, and in the sea , in Sardinia, around 5 y.old). Or wait he is already 14 or more. Of course, starting very yearly requires a special instructor for young ages...

This will result in one of the best regulator set ever built. Do you have a real Scubapro 156 (I mean, the CE compliant version with larger exhaust valve), or is it a standard 150-BA, like the one I have?

I also own a 129 (of course converted to BA). Great for side mounting, or back mounted twin tanks. It makes it impossible to confuse the left and right regs. Is that sort of cylindrical add on a filter, or an humidifier? The filter was useless, the humidifier instead was really great. Better...

That's true, of course. Everyone should conform to his training and to what he is confortable doing in safety. If one does perceive to not be "safe enough", aborting the dive is the proper choice. Please note that I also had a twin tank with reserve, and a small air tank for emergency inflation...

When it happened to me I did NOT thumb the dive, I continued with the working reg. This comes back to my training: I was taught to try solving problems underwater, surfacing is the very last option, to be adopted only when everything else fails, in true life threatening cases. Furthernore...

Did you try your second regulator? It happened to me a couple of times that the exhauist valve was bent, sealing imperfectly, causing the reg to "breath wet". Switching to the alternate one fixed the problem, allowing me to continue the dive.. You have two regs exactly for cases like this one.

My wife has a very low SAC, around 10 liters/minute or less (I am around 13). Years ago, she conducted routinely recreational deco dives in air, down to 50m max and with deco stops (never deeper than 6m) using a single 15 liters steel tank (3000 liters when full). At the time, I was using a...

I fully understand the need to give tips for allowing these people to survive. My point is that it is wrong to assume that giving a larger tip one gets a risk reduction! Some activities are dangerous, and one should search for REAL risk reduction methods. The idea that tip money can provide real...

I understand your concern. It can become truly dangerous. My wife, who was acting as supervisor of the trip, once lost one snorkeler at Maldives. The search lasted a couple of hours, finally she managed to find him, thanks to the hawk eye of one member of her Maldivian staff... After that...

And use YOUR brains for understanding what is really optimal FOR YOU. I appreciate standardisation and team coherence, but each individual has some peculiarities, and one should be elastic enough for adapting to them.

Because you have got a DIN 300 bar kit on a 200 bar combo DIN/yoke valve. Scubapro also sells, for a few bucks (49), the DIN 200 bar kit, which has a shorter screw, entering completely in the valve instead of leaving two threads out. With the DIN 200 bar kit, your reg would end in the same...

There are many models: https://www.freedivershop.com/lobster-freediving-neck-weight?___store=it_en https://deepbluesub.com/prodotto/collare-apnea-best-divers/ https://www.tradeinn.com/diveinn/it/best-divers-peso-del-collo-regolabile/136415709/p...

I suggest n. 3. It is what most free divers use here in the Mediterranean, with a stretchy and low drag 5mm wetsuit and long and light freeding fins. Perfect buoyancy, perfect trim, no drag. The neck weight is not really around the neck, it is behind your head and along your shoulders.