Director Jeff Wadlow faced significant logistical hurdles while filming The Devil's Mouth, an underwater thriller set almost entirely in water.
The production, backed by Lionsgate subsidiary eOne, follows a group of friends stalked by a predator inside a Thai freshwater cave system.
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Wadlow initially pitched a different project before accepting the script by Aja Gabel and Myung Joh Wesner.
The story centers on a complex female friendship, which drew him to the project.
Technical Challenges and Solutions
Filming in water disrupted standard camera operations.
Since characters spend most of the story actively swimming, traditional dollies, Steadicams, and handheld cameras were not viable.
"Water and movie cameras do not get along well," said Wadlow. "Add to that big lights running on electricity, and it’s a very tricky situation."
To protect equipment, cameras had to be placed in HydroFlex housings, which weigh about 120 pounds. This forced the crew to invent a new cinematic language.
Wadlow ran four cameras simultaneously and staged scenes continuously, treating them like a play to maximize limited water tank time.
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He also stayed in the water with the cast, using laminated shot lists and script pages to keep track of the plan.
Visual Approach and Set Design
Wadlow chose to open the film with expansive wide shots and drone footage to establish a false sense of security.
"Let’s sell the trip," he said.
"People should be excited to be here with our characters and not think this trip is a bad idea."
While establishing shots were captured on location in Thailand, interior action was filmed in soundstage tanks in Bangkok.
The crew built a 120-foot-long, 70-foot-wide cave set flooded with five feet of water.
Two sets were repurposed to represent the 13 distinct cave environments described in the script.
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"I had two sets, so I would just bounce between them and figure out which cave I could shoot," Wadlow explained.
