My team went through the Danish scout swimmer course in Denmark in '84. I'm one of the 230lb crowd and thought I was going to be strangled to death. It's pretty tight and might be better if one is into auto-asphyxiation.

That wasn't my best WET but I remember the tram being unable to open the gates of the snaplinks on the swim line when we came ashore on a particular "cold" night 5 k infil swim. Our hands would not move. Brrrrr Blitz.
As to WETs I was also in 10th group and many a cold cold night and navigating with an altermeter on ridge/elevation lines. Blitz