The Bermuda Triangle

The Bermuda Triangle

Year: 1978

Runtime: 112 mins

Language: English

Director: René Cardona Jr.

AdventureScience FictionHorrorHorror the undead and monster classicsGothic and eerie haunting horror

A summer cruise through the Caribbean takes a dramatic turn when the vessel and its passengers inadvertently sail into the notorious Bermuda Triangle. As the crew and travelers find themselves surrounded by inexplicable phenomena, tensions rise and they begin to confront the strange forces that seem to manipulate reality around them.

Warning: spoilers below!

Haven’t seen The Bermuda Triangle yet? This summary contains major spoilers. Bookmark the page, watch the movie, and come back for the full breakdown. If you're ready, scroll on and relive the story!

The Bermuda Triangle (1978) – Full Plot Summary & Ending Explained

Read the complete plot breakdown of The Bermuda Triangle (1978), including all key story events, major twists, and the ending explained in detail. Discover what really happened—and what it all means.

The Black Whale III sets sail into the Bermuda Triangle, carrying the Marvin family on a hopeful quest to locate the rumored remains of Atlantis. A mysterious Diabolical Doll drifts into their wake, and Diana Marvin—the family’s youngest daughter—claims it as her own. The doll seems to exert a strange pull over the ship, and Diana begins speaking in a cold, calculating voice, warning that everyone aboard will die and revealing the order of the fates. In a chilling moment, she traps the ship’s cook Simon in the freezer, a danger swiftly averted but deeply unsettling for everyone on board.

One night, the vessel glides toward a Fresnel lens signal—an SOS that never appears on the radar. The crew chooses to abandon the fruitless search when the signal is revealed to belong to a ship long lost to the sea.

Upon reaching their destination, the crew suits up for underwater exploration of ancient ruins. A submarine earthquake rattles the site and cripples the legs of Michelle, the family’s eldest daughter. The plan shifts toward seeking help from the island of Bimini, but a fierce storm battering the ship tears at the hull, damages the engines and helm, and throws everything into chaos. In the maelstrom, Simon dies in an apparent accident, a blow that echoes the doll’s ominous energy.

With supplies dwindling and Michelle in urgent need of medical attention, the ship’s mate Alan teams up with Dave, Michelle’s brother, to ride out in a motorboat toward Bimini. The voyage proves traumatic, and Michelle dies along the way, leaving the boat to drift and vanish into the endless sea. Meanwhile, Sybil, Diana’s aunt, vanishes as if swallowed by the same shadowy force that haunts the voyage, suggesting the doll’s influence reaches far beyond a single family.

Back aboard the Black Whale III, the captain Captain Mark Briggs keeps the radio line open, hoping for aid as distress calls from other ships—almost like echoes—filter through. When a contact is finally made with Bimini, the radar operator questions the tale: the Black Whale III supposedly disappeared twelve years earlier with a Marvin family aboard. The final moment leaves a grim, unresolved note as the ship itself seems to fade from sight, and the eerie Diabolical Doll remains floating in the water, a haunting symbol of the mystery that clings to the sea.

Last Updated: October 09, 2025 at 11:12

Mobile App Preview

Coming soon on iOS and Android

The Plot Explained Mobile App

From blockbusters to hidden gems — dive into movie stories anytime, anywhere. Save your favorites, discover plots faster, and never miss a twist again.

Sign up to be the first to know when we launch. Your email stays private — always.

Unlock the Full Story of The Bermuda Triangle

Don't stop at just watching — explore The Bermuda Triangle in full detail. From the complete plot summary and scene-by-scene timeline to character breakdowns, thematic analysis, and a deep dive into the ending — every page helps you truly understand what The Bermuda Triangle is all about. Plus, discover what's next after the movie.

The Bermuda Triangle Timeline

Track the full timeline of The Bermuda Triangle with every major event arranged chronologically. Perfect for decoding non-linear storytelling, flashbacks, or parallel narratives with a clear scene-by-scene breakdown.

The Bermuda Triangle Timeline

Characters, Settings & Themes in The Bermuda Triangle

Discover the characters, locations, and core themes that shape The Bermuda Triangle. Get insights into symbolic elements, setting significance, and deeper narrative meaning — ideal for thematic analysis and movie breakdowns.

Characters, Settings & Themes in The Bermuda Triangle

More About The Bermuda Triangle

Visit What's After the Movie to explore more about The Bermuda Triangle: box office results, cast and crew info, production details, post-credit scenes, and external links — all in one place for movie fans and researchers.

More About The Bermuda Triangle