raywest

Question: Is/was it really possible to smoke a cigarette on a submarine? (01:57:10 - 01:58:20)

Answer: Smoking was allowed on U.S. Navy subs up to 2010, though not when a sub was submerged. During WWII, there were restrictions about smoking on deck because the enemy could detect a glowing cigarette ember at night. After 2010, smoking was banned entirely. Foreign navies would have different rules, of course.

raywest

Answer: The engineering officer comes off as a bit of a rebel and the captain tolerates it as he is good at his job and is also one of the conspirators to defect.