Is serving on Navy submarines the hardest job in any of the services?
I mean you are basically crammed with lots of others in a metal tube under the water for months at a time. You never see the sun or get any fresh air during that time. Space is at a premium. Some sailors don't even get their own bunk and have to share. After the first two weeks, no more fresh food. Just canned or frozen food.
I'd likely go stark raving made on my second or third tour.
To those who do serve on a sub, you guys are crazy and tougher than I am!