Editing Scuba set (section)

===Closed circuit rebreathers===
An oxygen rebreather diver or a fully closed circuit rebreather diver consumes about 1 litre of oxygen corrected to atmospheric pressure per minute. Except during ascent or descent, the fully closed circuit rebreather that is operating correctly uses very little or no diluent. A diver with a 3-litre oxygen cylinder filled to 200 bar who leaves 25% in reserve will be able to do a 450-minute = 7.5 hour dive (75% × 3 litres × 200 bar × 1 litre per minute = 450 minutes). This endurance is independent of depth. The life of the [[soda lime]] scrubber is likely to be less than this and so will be the limiting factor of the dive.{{citation needed|date=December 2016}}

In practice, dive times for rebreathers are more often influenced by other factors, such as [[hypothermia|water temperature]] and the need for safe ascent (see [[Decompression (diving)]]), and this is generally also true for large-capacity open-circuit sets.{{citation needed|date=December 2016}}