The Devil’s Mouth is Prime Video’s new survival thriller, bringing together Kathryn Newton, Lana Condor and The Summer I Turned Pretty star Gavin Casalegno for a terrifying trip beneath the waters of Thailand. Directed by Jeff Wadlow, the film follows five friends whose final adventure together turns into a fight for survival when they enter a remote cave system and discover that something deadly is hunting them underwater. Prime Video has confirmed that The Devil’s Mouth will premiere globally on July 29, 2026.
With its young ensemble cast, claustrophobic cave setting and a bull shark lurking beneath the surface, The Devil’s Mouth appears to combine creature-feature horror with a story about friendships beginning to fracture under pressure. The film was also shot extensively on location in Thailand, making its tropical coastline, caves and open water a central part of the action rather than simply a backdrop.
Here is everything confirmed about The Devil’s Mouth, including its release date, cast, plot, trailer and filming locations.
What is The Devil’s Mouth about?
The Devil’s Mouth follows five friends who travel along Thailand’s coast for one final adventure before leaving university life behind and entering the working world.
Their trip leads them into a cave system known as the Devil’s Mouth, but the experience quickly becomes dangerous when they realise that something is pursuing them beneath the water. Trapped in the darkness, the friends begin to panic, lose their sense of direction, and question whether they can still trust one another.
When is The Devil’s Mouth released?
The Devil’s Mouth will be released globally on Prime Video on July 29, 2026.
The film is a Prime Video Original and is expected to stream directly on the service rather than receive a traditional cinema release.
Who is in the cast of The Devil’s Mouth?
The confirmed cast includes:
Kathryn Newton, Lana Condor, Gavin Casalegno, Nico Hiraga, Tommi Rose and Tayme Thapthimthong.
Newton is known for films including Abigail and Ant-Man and the Wasp: Quantumania, while Condor starred in Netflix’s To All the Boys trilogy. Casalegno is best known for playing Jeremiah in The Summer I Turned Pretty, and Hiraga previously appeared in Booksmart.
Thai actor Tayme Thapthimthong, who appeared in the third season of The White Lotus, plays the local guide who accompanies the group into the caves.
Who directed The Devil’s Mouth?
The Devil’s Mouth was directed by Jeff Wadlow, whose previous horror and thriller credits include Truth or Dare, Fantasy Island and Imaginary.
The screenplay was written by Aja Gabel and Myung Joh Wesner. An earlier version of the project was titled Apex and appeared on the 2019 Black List, an annual survey of highly regarded unproduced screenplays.
The film was produced by Basil Iwanyk, Erica Lee, Carsten H. W. Lorenz, Will Flynn, and Sam Greenberg. Amazon MGM Studios is listed as the studio, with the project also described by Deadline as a co-production with Lionsgate.
Where was The Devil’s Mouth filmed?
The Devil’s Mouth was filmed in Thailand, with production taking place across Krabi province, Chiang Mai and Bangkok.
According to Time Out Thailand, filming lasted approximately eight weeks and wrapped in September 2025. The production used Thailand’s caves, coastline and natural landscapes to create the isolated environment in which the friends become trapped.
The locations are especially important to the film because much of the story unfolds in or around the water. Newton told Cosmopolitan that the cast worked in the ocean, kayaked into caves, hiked through the landscape, and became certified divers for the underwater sequences.
Was The Devil’s Mouth really filmed underwater?
At least part of the filming involved genuine water and outdoor work rather than relying entirely on studio sets.
Newton said the cast trained as divers and filmed scenes involving swimming, kayaking and cave exploration. Wadlow also explained that the actors spent much of the production in water, dealing with cold conditions while performing for the camera.
Is there a trailer for The Devil’s Mouth?
Yes. Prime Video released the official trailer for The Devil’s Mouth in June 2026.
Is The Devil’s Mouth based on a true story?
There is currently no indication that The Devil’s Mouth is based on a true story.