Closed Circuit Rebreather
A modern, closed-circuit rebreather such as the Poseidon Discovery MKVI, which comes with gas supply monitoring and five separate warning and advisory alarms as standard, is simply the most efficient underwater life support system in the world.
Many experienced rebreather divers actually feel safer diving them than diving open-circuit, just as 747 pilots feel, and are, safer in their aircraft than in their far less complicated automobiles.
There are six major safety advantages that modern CCR they have over open-circuit. Find out more in Ian Forster’s groundbreaking paper entitled “Closed-Circuit is Safer than Open-Circuit”.