We had a guy on our boat that was 6’8” and he did fine. Maybe he was just used to ducking everywhere even outside of the sub.
Yup you wouldn’t fit in...they are “overheads” not ceilings.
https://en.wikipedia.org/wiki/Glossary_of_nautical_terms
LOL
You really need to take a tour of a modern day submarine. They’re huge.
This ex destroyer sailor was absolutely amazed at the roominess of a Los Angeles class sub. The overhead in one compartment had to have been well over ten feet.
Have you been on one? I toured the USS Gurnard, a SSN, back in the 1980s and I’m short and it STILL was a squeeze. Talk about claustrophobia.