It makes you suicidal.
Just ask Adolf Hitler.

@ragingloli I ment a small family bomb/tornado shelter. I would thing that I would start out as a vacation.

I was on a submarine…sort of the same thing. Bigger, noisier, and more people than in a bomb shelter maybe, but still no way to get out, no sunshine, no breezes (other than AC). The longest time I spent under water was about 2.5 months.

There were things that you don’t consider when you think of it. The smell for one. People didn’t shower every day, the equipment gave off smells…it all combined to create what I termed the Submarine Funk.
Another oddity was that, since you are removed from society, a lot of the societal norms go away. Not dreadful things, just people acting oddly and no one really cared. It seemed to be the human mind getting bored and creating ways to be entertained.

Food was not really an issue. We stored TONS of food. At the beginning of the underway, we had cans of food and supplies stored everywhere. In some areas they were stacked on the floor and we threw rubber matting over them so we could walk on them. But it was all canned goods, coffee, etc….not the traditional dehydrated survival food. We had fresh eggs stored in a torpedo tube but they only lasted a few days before they were gone, then it was powdered eggs. That was about as close to survival food as we got.