Kids, I need your help

I saw this movie, long ago, and I cannot remember what it was called.

It was on a ship? or a submarine? and the two ships/submarines were fighting against each other but then they all got sick so they banded together and housed the sick people on their ships/submarines. One of them was probably a German shipmarine.

This movie was probably a terrible movie. Every time I watch a submarine movie, I want to watch this mystery one.

Children, what is this movie?

I do not remember who is in it. Probably some men.

It is not U571. They just get blown up and the one guy drowns.