A moon pool is a chamber, e.g. on an underwater habitat or a submarine, that allows access to the water. I am trying to think of a movie that features one.
I remember reading about one in the Michael Crichton book Sphere, but I don't recall seeing the movie.
I know of The Abyss (1989), but I also don't think that's the movie I'm thinking of.
It may have been a James Bond movie, or a movie about Navy SEALs/special forces. I am pretty sure the moon pool was part of a submarine, but it may have been a surface ship. The movie was most likely released after 1980.
Does anyone have any ideas as to what movie I am thinking of?