A 1943 submarine film about the British submarine Sea Tiger (P61). Returning from an unsuccessful patrol, the crew of the Sea Tiger is given a week's leave, only to have it cut short when they receive orders to sink the new German battleship, the Brandenburg. Unfortunately the Brandenburg puts to sea early, and Sea Tiger is forced to chase it all the way to the Baltic, leaving the sub low on fuel and the skipper contemplating scuttling the ship and surrendering to the Germans. Until one of Tiger's crew comes up with a plan...
- Artistic License – History: The only battleship named Brandenburg the German navy ever had was a pre-dreadnought ship that was scrapped in 1920.
- Captain's Log: Written instead of spoken, it's part of the Time Passes Montage as the Sea Tiger hunts the Brandenburg.
- Crazy Enough to Work: Using captured Luftwaffe uniforms and a crewman who speaks German and knows a particular port very well, the Sea Tiger sails right into an occupied Danish harbor and refuels itself.
- Faking the Dead: One of the reasons the Tiger runs low on fuel is that it dumps a significant amount to convince a German destroyer that it's been successfully depth charged, after attacking the Brandenburg.
- Reality Has no Subtitles: The scenes where Germans or the German speaking member of the Sea Tiger's crew are speaking are not subtitled.
- Submarine Story: Fits all the tropes, with most of the action taking place in the confines of the Sea Tiger.
- Tokyo Rose: A "Haw-Haw" broadcast reports the sinking of the starring submarine HMS Sea Tiger (In fact, it pretended to go down to throw the Germans off). The British Admiralty buy the story and the British press report the vessel as lost.