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Technical EANx (Nitrox) Diver with mixtures of 25% to 80% (oxygen) for dives down to 150 ft / 46 m with no stage decompression, using 80% EANx (Nitrox) for decompression and 25% to 60% EANx (Nitrox) for bottom mix.

Diving down to between 130 ft / 39 m and 200 ft / 60 m , but not using air below 39 m Trimix is the stuff to use for minimizing narcosis on dives to this distance.

Helitrox - 26% oxygen / 17% helium - diving is using helium down to 150 ft / 46 m, if using stage decompression EANx and / or oxygen is used for the decompression. A few technical knowledge has to be obtained, maybe at a NAUI center, to tell you the possible problems on diving in such deep like oxygen toxicity, nitrogen narcosis, emergency planning, equipment problems, decompression sickness, omitted decompression etc.

A rebreather is fundamentally different to open circuit scuba diving which uses compressed air and regulator to control. The air outflow are the well known bubbles. Open circuit scuba diving is wasting a lot of oxygen with every breath and the amount of wasted oxygen increases with depth.

But the main forces behind the technical implementation of rebreather were the military, because being on a secret mission and the enemy watch for bubbles which must come is not very amusing and might end deadly for the guys down there.

There are three types of rebreather, oxygen rebreather, semi-closed rebreather, and closed-circuit rebreather.

Every type of rebreather has some positive and some negative features and the basic components all have in common are a breathing loop with the usual mouthpiece and a way of emitting the exhaust air, this exhaust flows into a bag called counter lung.

Naturally the CO₂exhaled must go somewhere, it is moved to a small container and neutralized by some chemicals.

To make sure this goes in the right direction two valves are in the loop a - upstream check-valve plus a downstream check-valve to control. Another valve -shut-off valve- in the mouthpiece is used to prevent water from coming into the breath loop.

The difference of this 3 rebreather is the way in which they add gas to the breathing loop, and control the concentration of oxygen in the breathing gas.