Survival in the Deep
Prime Video Sets July 29 Premiere for 'The Devil's Mouth,' A Thrilling Freshwater Shark Survival Story
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Key Points
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The screenplay for The Devil’s Mouth was featured on the 2019 Black List, signaling early industry recognition for the script.
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The project is a Lionsgate co-production with Prime Video, illustrating a cross-studio collaboration for the film’s release.
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Filming largely took place in water, with the cast in the water for most of the movie and the Thai crew described as extraordinary for meeting the demanding on-water production.
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A notable scene involves a bull shark attacking Gavin Casalegno’s character in the freshwater cave sequence, underscoring the film’s unusual shark-in-cave setup.
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Kathryn Newton explains Sara’s arc as trying to carve her own path while maintaining her close friendship with Max, highlighting the relational tension that drives the survival thriller.
Prime Video will debut *The Devil's Mouth* on July 29, 2026, a survival thriller about college friends trapped in a Thai cave with a bull shark hunting in freshwater. The film stars Kathryn Newton and Lana Condor and is a co-production between Lionsgate and Prime Video, according to UPI.
The screenplay earned a spot on the prestigious 2019 Black List with 12 votes, signaling strong early industry interest. The film is rated PG-13 for violent content, disturbing imagery, and brief strong language, per Fangoria.
A Shark in a Cave Tests Friendship Under Fire
The film follows a group of college friends whose Thailand vacation turns deadly when they get trapped inside a maze-like cave system. A bull shark — a species that can actually survive in freshwater — hunts them through the dark, flooded tunnels. The setting draws comparisons to *The Descent* (2005) more than a typical ocean shark film, Fangoria notes.
Director Jeff Wadlow wants audiences to see the cave itself as the real threat. "The shark is a catalyst, but the cave is the villain," Wadlow said. Kathryn Newton's character Sara faces both physical danger and personal tension. "When the water starts rising, those internal tensions become as dangerous as what's in the water with them," Newton told Entertainment Weekly.
75 Days Shooting in Water Pushed Cast to the Limit
Principal photography ran roughly 75 days, with about 60% of that time spent in water-based sequences in Thailand and Bangkok water tanks. The cast spent up to 10 hours a day in the water. Lana Condor praised the local crew as "the backbone of the production," saying they managed complex underwater rigs for long takes without surface breaks, according to Yahoo News.
Gavin Casalegno, who faces a pivotal bull shark attack in the film, described the psychological toll of the cave sequences. "There's a psychological weight to being trapped in a maze where you can't see more than three feet in front of you," he said. The freshwater cave setup is the film's central hook — bull sharks are real euryhaline animals, meaning they can live in both salt and fresh water.
Lionsgate and Prime Video Bet on Mid-Budget Genre Films
The film skips theaters entirely and goes straight to Prime Video on July 29. Industry analysts see this as a test of the Lionsgate and Prime Video partnership. By going global on day one, the studios aim to boost subscriber engagement rather than chase box office receipts, UPI reported.
The combined Instagram following of leads Newton, Condor, Casalegno, and Nico Hiraga tops 35 million followers — a built-in marketing engine for the release. Horror-focused outlet Fangoria noted some concern among genre fans about whether the PG-13 rating dilutes the original script's edge, pointing to a gap between studio marketing and the director's stated "relationship drama" vision.
Black List Pedigree Sets High Bar for the Script
The original screenplay by Aja Gabel and Myung Joh Wesner landed on the 2019 Black List, an annual survey of Hollywood's most-liked unproduced scripts. Since 2005, Black List scripts have gone on to win more than 50 Academy Awards. That pedigree raises expectations for *The Devil's Mouth* beyond standard streaming horror, according to Ledger-Enquirer.
Wadlow and his writers revised the script for production, and Fangoria notes that horror fans are watching closely to see how much of the original grit survived the move to a PG-13 studio film. The movie streams exclusively on Prime Video starting July 29.
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