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The cleaned, analysed and adjusted breathing gas then passes through the inhale hose that runs over the diver’s left shoulder directly to the mouthpiece, and the breathing cycle repeats. No breathing gas is vented to the surface – it is continuously cleaned, analysed and corrected as it is rebreathed.

The right-hand cylinder holds high-pressure 100% oxygen. The left cylinder holds the ‘diluent’, the desired breathing gas – air or trimix. The small black cylinder on the left holds the diver’s drysuit inflation gas. © Bob Anderson.

Of course, too much oxygen is also a problem. If something goes wrong, say the solenoid switch sticks open and the oxygen level in your breathing gas goes above that set level, audible alarms go off and red lights blink on the heads-up display (HUD) unit that is usually mounted on the corrugated hose breathing tube just below and off to one side of your mask in your peripheral vision. Too much or too little oxygen, and the normally green lights start flashing red warnings.