What is a diluent gas?
There are two 3 litre cylinders, one filled with pure oxygen, the other with a diluent gas. Diluent is manually injected by the diver to maintain volume as the counterlung collapses with increasing depth. With the Inspiration the diver has the option of Air, Trimix or Heliox as a diluent. The depth limit is governed by the diluent gas used. If air is used the depth limit is the same as for open circuit air, which is 50m.
