@romainbarissat I've gone Scuba diving before, and know that a tank holds a lot of compressed air, and at depths the air gets used much quicker. If this device only claims to offer breathing in depths 15ft or less, it makes me wonder that it could be possible to have a small amount of air which is usable in shallow waters.
Or it might be bullsh*t. Hard to say.
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@kristofertm From what I read, I think that particular device is bullsh*t because it doesn't claim to store the air, it claims to convert the water into air.
However what you say is true and there are mini tanks like http://spareair.com but I think I remember reading it only lasts very few minutes (maybe 5-15).
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