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I generally use a PO2 of 1.3 bar, but with deep repeat dives I back it off to 1.1 bar just to stop racking up too high levels of oxygen over a period of days. I usually manually inject oxygen in my final decompression stops to keep the PO2 at 1.4 bar and shorten decompression.

The wrist-mounted computer handset on my Inspiration Vision CCR. The top left figure reads 0.70 and confirms the pre-set PO2 set point being used. The three figures –in this picture all at0.81 – show the individual readings of the three oxygen monitoring cells that continuously analyse the breathing gas. The readings should be roughly consistent – if one figure differs wildly from the other two then it is an indicator that the cell is possibly malfunctioning.

The horizontal white rectangle at the top is the scrubber monitor: it displays how the scrubber in the back-mounted canister is performing. © Bob Anderson

A fully rigged technical diver with a shallow bailout nitrox cylinder slung beneath the right arm on the ‘oxygen’ side. In this case the cylinder holds EAN50, which has a maximum breathing depth of 20 metres – and this is clearly marked on the cylinder, to avoid the wrong gas being breathed at the wrong depth, a standard tek diving practice. To breatheEAN 50 deeper than 20 metres for a prolonged time risks an oxygen toxicity hit with possible fatal convulsions. The mask strap is under the hood,to avoid it being kicked or knocked off.© Bob Anderson