Abstract: An improved diving habitat for providing breathing gas to a diver in which expired breathing gas is recovered from the habitat utilizing an indirect fluid coupling which is in fluid communication with the interior of the habitat and with a recovery line adapted for connection to a diving gas reconditioning system, the coupling providing for the transfer of the expired breathing gas from the habitat to the recovery line under normal conditions and further providing for a flow of water to the recovery line from the water environment in the event of a dangerous change in pressure in the recovery line.