Semi-Closed & Closed-Circuit Rebreather Courses

Whether you’re a photographer or deep-dive enthusiast, rebreathers will revolutionize the way you dive. Free yourself of heavy tanks, experience dive times up to four times longer, lesson decompression time and dehydration and — since rebreathers produce few, if any, bubbles — you’ll get nose to nose with the marine life for great photos and video!

Semi-Closed Rebreathers

SCRs provide longer underwater durations than open-circuit and are fairly simple to learn, making an SCR course an ideal way to get into rebreather diving. SCRs, such as the Draeger Ray, supplies one breathing gas such as air or nitrox or trimix. The gas is injected into the loop at a constant rate to replenish oxygen consumed from the loop by the diver. Excess gas, however, must be constantly vented in small volumes to make space for fresh, oxygen-rich gas. As such, they are more wasteful of oxygen than CCRs, but a good first step.

Closed-Circuit Rebreathers

Military, photographic and recreational divers love CCR’s these because they allow long dives and produce no bubbles. CCR’s generally supply two breathing gases to the loop: one is pure oxygen and the other is a diluent or diluting gas such as air or Trimix. In fully automatic closed-circuit systems, such as the AP Inspiration, a mechanism injects oxygen into the loop when it detects that the partial pressure of oxygen in the loop has fallen below the required level. Aquanauts offers several courses to get you certified on the Inspiration/ Evolution CCR.

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