What minor things can go wrong with an underwater base? - I don't actually want leaks or anything dangerous, more like temperature changes throwing the instruments off so that the engineer can gripe about it while everyone else rolls their eyes.
While on surface leave (in a Singapore-like, Portuguese-speaking city built on a group of old offshore-drilling-platforms off the coast of Angola), one of the main characters is kidnapped by thugs in the pay of the story's Big Bad, tortured, and interrogated about one of his colleagues for approximately 48 hours before his mates are able to locate and rescue him. They are now trying to get him to safety and treatment in their own medical bay - it was a taking-the-law-into-your-own-hands sort of rescue, so they're nervous about taking him to a hospital, plus they no longer feel safe in the city. The thugs were under orders "not to leave any marks" on the guy, so they deprived him of sleep, food and drink. He is now mostly suffering from dehydration.
Question: actually getting to the sea-floor base is likely to be a lengthy process - I'm guessing that traveling to the bottom of the ocean has to be done slowly to avoid pressure problems (would his condition be exacerbated by these?); though perhaps not as slowly as coming up. In the meantime, how much treatment can he receive on the sub they're taking back to the base? What is he likely to need anyway? - I'm envisioning an IV drip to rehydrate him but would a small sub be that well-equipped? (I can hand-wave a bit because it's the future). Would they have to just give him water/fruit juice to drink? If an IV is used, how long would he likely stay on it, and how long generally would it be until he's up and about and griping about being allowed to get back to his job?
Other question - the same guy was raised by parents who were so worried by the current media blitz about childhood obesity that they went to the other extreme and either starved him or raised him to fear food, despite his being of a fairly slim build anyway. As an adult, I have him chronically underweight because he has to consciously force himself to eat, and a lot of the time he doesn't want to. The idea is that he's doesn't actually think he's fat, but he's grossed out by the physical sensation of chewing and swallowing. Is this plausible? Also how would it affect the above scenario?