Excellent movie. I wouldn’t be able to last a day under such claustrophobic conditions, especially submerged.
One of my favorite sub movies is The Enemy Below with Robert Mitchum as the American captain of a battle cruiser up against Curt Jurgens as the German captain of a U-boat. Battle of wits between two men fighting for their country and their crew.
My sweetie (who passed away two years ago) spent 8 years in the Navy. He was about half of that time in submarine schools or in subs. He loved it & regretted getting out. Interestingly, he had the opposite of agoraphobia. He loved tiny, closed in spaces. There’s a job for every personality. :-)