A submariner's tale, one of the people who man the sonar on a nuclear submarine starts to hear sirens in the deep. An as all who hear their call, desired to join them. The other crewman are put in peril because of this and attempt to stop him from sinking the boat in order to get out.
What kind of creature would an underwater siren be like? What would they sing and how do they sing?
Okay, now place this during World War II in the North Atlantic.
Got that? Okay, now place it in space.