I remember a wessex from Chivenor made the news years back with a potential bends case by flying under the Tamar bridge on the way to Bovisands,
Coming from that part if the country, I'd love to know where the diver was diving in order to warrant that particular route to Bovisand
I was told, as part of a brief by the operators of a decompression chamber somewhere close to the Sulu Sea, that as air pressure decreases with height the lower the better, in an attempt to keep the gas bubbles as small as possible en route to the chamber.