This is driving me crazy because I know I’ve seen this movie but nothing I type into Google yields any results. So basically it’s an American movie and these people are in a submarine type thing and there is a sea monster well everything there is an attack this one crew member always misses it cuz he is sleeping. Well it turns out that he IS the sea monster. Or rather, he is controlling this sea monster while he is sleeping, but he has no idea he’s doing it. That’s all I remember.