Oh brother!
We were dropped in the Pacific Ocean at 2 am 3 miles offshore with a Mark I, fins and a mask!!! 30 ft straight down out of a chopper, in the dark, prettyFREAKING cold, (70 degrees or so) and told tobe on the beachin 1 1/2 hours... And had to stay with our buddy no matter what! Then when we got there, we assembled a squad and took the boat out for a casual swim in the surf! And that only takes up about 3 hours of our hell week...

That was way back in the 70's, the new guys have it easy compared to those days...