Much respect to you. I can't do confined spaces for any length of time.
I spent a day with a group of WWII diesel sub vets one 4th of July. Those guys and their wives were rowdy as all get out and a lot of fun to hang out with and they were all in their eighties or so at the time. There was one Chief of Boat (?) who had 4 boats shot out from under him by the Japanese and he went back again. Twice.
The funniest part was their wives trying to hook me up with every cutie on the side of the parade route we were on.