U-boats Westward!

[1] It centers on a U-boat mission in the Battle of the Atlantic and was produced by UFA.

The U-boat used for the film was U-123, which would later play a major role in Operation Drumbeat.

It then follows the crew onshore the day before they ship off for their next mission—meeting their families and sweethearts, spending a last night at a club, and so forth.

The boarding of the ship is shown being done professionally and in a non-confrontational manner.

You can help Wikipedia by expanding it.This article about a film on World War II is a stub.