Very impressed with the crew of that nuclear submarine by the way, quite young some of them, but look highly trained and well disciplined, excellent courteous manners too towards their guest. Submarine crews are cherry picked I suppose, it cant be for everyone, that way of life.
Crawled down some long tubulars in the oil rig fabrication industry to do some girth back welding, never been over claustrophobic … one time I did have a mini panic, closed my eyes , took deep breaths and counted to three slowly, took stock, opened them and was OK again, oh to be young and reckless again, my now portly frame might not fit inside those same small diameter steel tubes any-more I think
Have done an MRI scanner, they are very loud, lots of clunky noise, again intserted into a tube, for minutes, sometimes 10 minutes at a time in my case for my various spine problems, they gave me headphones and choice of radio stations to listen to that partially drowned out the machines noise … made it with no panic … but hope I never have to do that again!
Looks like something out of 2001 the movie, doesn’t it.