''The Bermuda Depths'' is an obscure 1970s horror movie that manages to combine [[{{Kaiju}} Giant Monsters]] and [[BoyMeetsGhoul Supernatural Romance]]. It was coproduced by Creator/{{Rankin Bass|Productions}} and Creator/TsuburayaProductions of ''Series/{{Ultraman}}'' fame.

A drifter named Magnus returns to his home in Bermuda (which he left after his father was mysteriously killed years before) and is reunited with Eric, an old friend who is learning about marine biology from an old scientist named Dr. Paulus. They end up investigating evidence of a giant turtle inhabiting the local waters.

Magnus also meets a mysterious, beautiful woman named Jennie Haniver, who turns out to have been a childhood playmate of his; in fact, he’s still wearing the seashell necklace she gave him. The thing is, she only appears when he’s alone, and even Eric tells Magnus that they believed Jennie was just an ImaginaryFriend of his. He insists that she was real, and that he even carved his and Jennie’s initials on the back of a turtle they played with.

Eric’s wife explains that Jennie Haniver is a local UrbanLegend: Two hundred years ago, a young woman whose ship sank in a storm in the BermudaTriangle made a DealWithTheDevil so that she would survive. Naturally Magnus refuses to believe it is the same Jennie.

Eric becomes obsessed with catching the giant turtle and against all warnings uses a harpoon cannon on it. This just leads to the creature killing him and Dr. Paulus. Jennie is revealed as indeed being supernatural in the process. Magnus survives the incident however.

The movie ends with Magnus leaving Bermuda, and [[spoiler:throwing the seashell necklace into the sea]]. Then we see the giant turtle swimming below and are shown that [[spoiler:it still has the lovers’ initials carved on its shell]].

!Tropes in ''The Bermuda Depths'':
* BermudaTriangle: One of the oddest takes on the legend: “It was a giant turtle demon.”
* BlackBestFriend: Eric
* BoyMeetsGhoul: it is never exactly clear what Jennie was--ghost, cursed immortal, etc.--or why she first appeared to Magnus as a little girl.
* TheDrifter: Magnus
* EatenAlive: Magnus' father, apparently for finding evidence that the turtle demon existed.
* EnemyMine: The people who made ''Westernanimation/FrostyTheSnowman'' join with the people who made ''Series/{{Ultraman}}'' and this was the result.
* GlowingEyesOfDoom: Both Jennie and The One Below show them.
* HoistByHisOwnPetard: Eric dies [[spoiler:yanked underwater by the harpoon line]].
* KeepCirculatingTheTapes: For a long time, even the very existence of the movie was in doubt and copies were very hard to find.
* TooDumbToLive: Eric
* WhoWantsToLiveForever: Jennie came to regret her pact but cannot escape it.