And of course there is immersion shock - the sad case of those North Sea oil rig workers who died after being lifted from the sea - they had been in the water so long that their veins had relaxed [1] and when they were winched out the blood pooled in their feet and insufficient blood got to the brain.
I've always wondered about this and long dives. How long do you have to be immersed before this becomes a problem?
Janos
PS - Simon - I've head rumours about your talk at the GUE conference - will you publishing / summarising it online anywhere (especially the exercise stuff).
[1] - Not physiologically true - something that does something to the somethings I think.
