North Sea Swimming
I was in the V force in the late 60s and we all toddled off to Bridlington to be dumped in the sea and collected by a chopper everycouple of years
If you went when the sea was cold you got a leaky goon suit if not you went in your oldest flying suit
The training was excellent with dragging in the harness and practice at getting out of the crutch loop
I think someone died of aheart attack having jumped in the sea to quickly from the nice warm hold but it was along time ago so it could just be a story