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Either way, the trapeze or separate weighted buoy line can be laced with spare bailout cylinders of breathing gas at different depths to make sure everyone has enough gas if there is a problem. As rebreather divers, we all carry our own bailout cylinders under our arms, which hold sufficient breathing gas for us to do the whole dive open circuit if the rebreather malfunctions and we have to bail out off it onto our spare cylinders. So, in theory, no one should need any gas. But the unexpected often happens … as divers we say you can never have too much gas underwater. But you can have too little – and then you are in big trouble.

The practice is that the trapeze is carabinered to the downline at a suitable depth with a transfer line – that is, a line that allows divers to transfer from the downline to the trapeze.

As the last diver comes up from depth at the end of the dive, when they arrive at the point where the trapeze or deco station is carabinered to the downline, the transfer line can be unclipped from the fixed downline. Everyone then goes for a drift, holding on to one of the trapeze bars. Drifting with the current in a fixed body of water, you now feel that you are stationary in the water – whereas, in reality, you are speeding over the seabed far below at anything up to a knot.