History Film / TheAtomicSubmarine

* GadgeteerGenius: Having repaired itself, Cyclops will return to its planet and come back with an invasion force. Fortunately, the skipper has a couple of scientists on board who know how to combine a homing torpedo with an ICBM to make a water-to-air interceptor missile! And that's how SUBROC was invented, folks.

* ImMelting: A couple of {{Redshirt}}s meet their end this way, apparently scorched by the USO's defense system or radiation from its drive powering up.

* JustBetweenYouAndMe: The alien is nice enough to explain the whole EvilPlan, instead of just luring Holloway into a trap and rendering him unconscious. Then again given that the alien appears to be all alone on the spacecraft, it probably just wanted someone to talk to.

* OrganicTechnology: Cyclops is LivingShip and can repair itself even after being rammed, sealing up the hole to prevent the ship's atmosphere escaping. The aliens in turn can modify themselves to adapt to any environment and intend to do so to colonize Earth.

* SlowDoors: Zigzagged; Carney gets crushed when he tries to flee through the DilatingDoor. Holloway is able to dive through just in time, though he nearly gets his foot caught. Then Nielsen is able to hold open the last door for him, even though it was strong enough to kill Carney.

* GadgeteerGenius: Having repaired itself, Cyclops will return to its planet and return with an invasion force. Fortunately, the skipper has a couple of scientists on board who know how to combine a homing torpedo with an ICBM to make a water-to-air interceptor missile! And that's how SUBROC was invented, folks.

** Instead of a SLBM being launched from vertical tubes inside the hull, the ''Tigershark'' pivots the missile (incorrected called an ICBM) from a horizontal position until it's standing on top of the submarine, whereupon it fires.

** Instead of a SLBM being launched from vertical tubes inside the hull, the ''Tigershark'' pivots up an ICBM from a horizontal position until it's standing vertically on top of the submarine, whereupon it fires.

** Instead of a SLBM being launched from vertical tubes inside the hull, the ''Tigershark'' pivots up an ICBM from a horizontal position until it's standing vertically on top of the submarine, and then it fires.

** Instead of an SLBM being launched from vertical launch tubes inside the hull, the ''Tigershark'' pivots up an ICBM from a horizontal position until it's standing vertically on top of the submarine, and then it fires.

* HotTopicPhlebotinum: The world's first nuclear-powered submarine ''USS Nautilus'' had done the first underwater transit of the North Pole the year before.

* FleshVersusSteel: The alien with its OrganicTechnology versus the humans with their advanced submarine of atoms and metal.

* GadgeteerGenius: Cyclops will recharge and return to its planet, returning with an [[AlienInvasion invasion force]]. Fortunately, the skipper has a couple of scientists on board who know how to combine a homing torpedo with an ICBM to make a water-to-air interceptor missile! And that's how SUBROC was invented, folks.