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To keep the divers together in a loose single group on the trapeze for deco, we restricted bottom time to 35 minutes.

All divers were required to carry a minimum of one red DSMB with their first name or initials written in large black letters on the top of it, together with a whistle, hi-vis flag and yellow DSMB for emergency signalling. This was no place to be separated from the dive boat and not be seen.

The team would arrive in Orkney on Saturday 28 May and load kit onto the Huskyan, and once everyone was sorted out with cylinders filled and analysed, scrubbers filled with sofnalime, rebreathers all prepped and set up, we would have a briefing that night. Diving would start the next day, Sunday 29 May, with two shakedown dives on the deepest German World War I battleship in Scapa Flow, the upturned SMS Markgraf in 45 metres. The early morning dive would be a simple personal shakedown dive to reveal any problems that might have occurred in transit and so that people could make sure they were happy with their kit. The afternoon dive would be a full dress-rehearsal, deploying the trapeze, adding the extra bailout cylinders and everyone transferring from the wreck to it for disconnection from the downline and a free-drifting decompression.