Rebreathers Print

There are a considerable variety of rebreathers available on the market today and each has their proponents. Basically a rebreather is a machine worn on the back of the diver allowing unused exhaust  gas to be reused rather than letting it be vented into the water as in open circuit diving.


  • Offer a much greater gas supply than the alternative open circuit equipment
  • Supplies an optimum gas mix which gives greater decompression efficiency
  • Few or no bubbles limits percolation off a cave ceiling therefore increasing visibility
  • A rebreather loop delivers warm, moist gas to the diver improving thermal comfort in the water and limiting dehydration
  • Gas costs are reduced


  • Open circuit bailout gas must be carried increasing a divers profile
  • As rebreathers are complex machines they require continual vigilance, more training, higher initial financial outlay and have greater potential dangers
  • Wearing a rebreather on the back limits a divers access to some Australian caves and cave passage

rebreatherJohn Dalla-Zuanna diving a KISS rebreather in Tank Cave | Photo: Dr Richard (Harry) Harris

Dive Systems

by Sheck Exley

A book by the world-renowned cave diver, the late Sheck Exley. A compilation of case studies of accidents that occurred in the USA and how to learn from them.


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