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I thought at first that they were diving with rebreathers but then noticed at a number of instances throughout the video that there were bubbles coming from their mouths. is this an "all in one" type bundle that there wearing? or is it that rebreathers actually expel gas at some point through their operation? It was always my understanding that rebreathers recycled the air and produced no bubbles..... however the more I think about it now the less that sounds correct since (if I understand correctly) in order to dive at different depths the mix needs to be adjusted and the added gas would need to displace existing gas.
Maybe its just my understanding about rebreathers that needs to be corrected....
Thanks
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"A lot of people attack the sea, I make love to it."
Jacques Yves Cousteau
The lower right corner says Cousteau. They're well known for using tanks encased in a shell because it looks cool. My guess is that this is just regular open circuit scuba.
That looks like an updated version of a tank system they used decades ago- It was basically three smaller (30ish) tanks manifolded together inside a plastic case.
They're open circuit systems with small tanks under a cover. If you want to know more about them, PM Blair Mott that's probably him holding the light in the video. He's been their Chief Diver for over a decade.