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They've been around longer then Open Circuit. They come in a few flavours but basically all have an ambient breathing loop incorporating a scrubber to remove CO2 and a counter-lung that is basically...

Freedived a lot as a teenager living in the tropics. Up until a few years ago, could still do 3 lengths of a 50m pool on a single breath, along the bottom, no fins. Got my NZUA ticket in 1980 (CMAS 1...