"Maclovin, The incident you refer to earlier in 2009 was actually about 10 miles off the coast rather than at the Miller, I think if my memory is correct the vessel involved in recovery was the same that was only a couple of miles away and witnessed the incident as it happened? Not much issue with swell, current and fairly shallow waters so was a much easier job."
Simfly, the point I'm trying to make, is that sat divers should be used here instead of air divers precisely BECAUSE the conditions at blackrock are so difficult. Sat divers can work safely in much worse weather and tide conditions than surface divers on air, and for much longer.
Incidentally the helicopter crash in 2009 was witnessed by the crew of a supply boat which went straight to the scene to search for survivors. The DSV Bibby Topaz was mobilised subsequently from the forties field for the recovery. Apologies to all for the drift.