Re: Movies of the Sea ...
Has to be about the Sea, eh? Tough one.
But there are the classic war movies "at sea"
Das Boot (german with english subtitles)
Hunt for Red October and a corny "modern" movie:
and there are others.
Jaws (#1 only, no sequels)
Unbroken, which has the first third -to - half of the movie with the men stranded in the life raft.
I'm not sure any of these qualify as "nail biters", though. Frank, what's one besides Perfect Storm that comes to your mind?