Man on Submarine Sees Alternate Image in Mirror

by Holly
(Vancouver, Washington, USA)

Does anyone know what this film is about a man on a submarine?

A crew is on a submarine or some kind of boat. A crewman disappears and another one goes off to look for him in the dark. He passes a mirror and his reflection seems to take on a life of its own. He sees it out of the corner of his eye and goes back to look. At first he sees himself, but then his mirror image morphs. He screams and it cuts out.

What movie is this?