Mk IV Discovery rebreather recycles oxygen for longer diving

The Poseidon Mk IV Discovery is a device that is going to revolutionize the way people underwater dive. It will allow for comfortable, safe and quiet diving thanks to an oxygen recycling system. Yes, it's capable of taking your used oxygen and make it usable again with p02 scrubbing and an oxygen cells. It is as simple as slapping on your back, allowing the system to do its self checks and diving.

This system is supposedly cheaper than the traditional open circuit scuba systems as well. And because no oxygen is being breathed out, there will be no air bubbles so James Bond and other spies can dive unnoticed. It does require refillable tanks of the oxygen cells and a rechargeable lithium-ion battery, but the system is well equipped with safety equipment to warn of low levels.

Poseidon Mk IV Discovery, via Popular Science