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

With Jill Heinerth and Jeff Loflin

Dive pros Jill Heinerth and Jeff Loflin lead you through the fundamentals of sidemount diving in this comprehensive video guide.


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