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A diver tag in/out system was used for all dives during the expedition with named tags for all divers being supplied. The tags were clipped to a brass ring where the transfer line from the trapeze connected into the fixed downline. (Author’s collection )

We would be using a decompression trapeze with horizontal bars at 6, 9 and 12 metres, and ropes leading up at either side to two large red buoys that would float it. We intended to lay two fixed downlines, one at the bow of the wreck and one at the stern. The trapeze would be secured to the bow or stern downline by a transfer line on a daily basis. Extra cylinders of bailout gas would be clipped to the downline and the trapeze in case of emergency.

A diver ‘down / up’ logging system using named tags was employed to monitor who had left bottom and ascended to the trapeze. Each diver was given a stainless steel shackle with a colour-coded plastic name tag on it, with their name. Individual divers clipped their named tags to a brass ring in the transfer line at a depth of 30 metres on the descent. Divers would remove their tag from the ring as they ascended at the end of the dive and moved along the transfer line to the trapeze for decompression. The last diving pair ascending would disconnect the trapeze from the downline before continuing their ascent up the trapeze transfer line. All 12 divers would then begin to drift with the current, which would be picking up as slack water passed, as they slowly ascended through the various levels of their decompression stops.