Hollis Prism 2 Rebreather

  Technically FocusedThe PRISM 2 is an electronically or manually controlled, constant PO2, modular, closed circuit diving system. As open circuit (SCUBA) divers, we rely upon filling our lungs with air from a pressurized gas tank with every inhalation and then exhausting that volume of air into the surrounding water with every exhalation. As we descend deeper, the water pressure around us increases, and the volume required to fill our lungs increases; in other words, our air supply depletes more quickly the deeper we dive. A rebreather recycles rather than vents the exhaled breath. The exhaled breath passes into a closed loop, where it is pushed through a chemical absorbent (scrubber) to remove the carbon dioxide and returns through the other side of the loop for the diver to re-breathe, hence the name “closed circuit rebreather” or CCR. Breathing LoopIts breathing loop, which is a keyed one-way assembly, consists of a closable mouthpiece assembly with mushroom/check valves on either