Regarding Deadliest Catch - I don’t know if it’s happened multiple times, but the time I saw a guy go completely nuts, the captain specifically said the contract states they don’t have to bring him back until the boat is ready to go back, but the guy had threatened to put on a survival suit and swim back to shore, so they decided for his own safety to bring him back.
There have been other times when someone just quit, but didn’t go crazy, and the captain just told him to stay in his bunk and not bother anyone else until they had full tanks and were ready to go to port.