Worth reading the linked page [0] about one of the diver's custom reassembled rebeather, which means they have two systems to reduce the need for backup tanks o

Worth reading the linked page [0] about one of the diver's custom reassembled rebeather, which means they have two systems to reduce the need for backup tanks of air, but still be able to fit in the caves. Really incredible, particularly as they work as volunteers. [0] - http://www.therebreathersite.nl/06_Homebuilders/john_volanthen_c-96.htm http://www.therebreathersite.nl/06_Homebuilders/john_volanth...