Five friends head into a flooded Thai cave system for one last adventure — and find something waiting for them in the water.
What is The Devil's Mouth about?
Before the real world catches up with them, five friends set out to explore The Devil's Mouth, a cave system in Thailand known for its narrow passages and half-submerged tunnels. The trip is meant to be a send-off, a last burst of freedom before jobs and responsibilities take over. That plan unravels once the group realizes they are not alone down there: something fast, silent, and built for the dark is hunting them through the flooded chambers. As oxygen runs low and exits become harder to find, the friendships that got them into the cave start to strain under the weight of fear, blame, and every wrong turn. The film plays out almost entirely in tight, waterlogged spaces, turning claustrophobia itself into part of the threat.
About the cast
Kathryn Newton and Lana Condor anchor the ensemble alongside Nico Hiraga and Gavin Casalegno, with Tommi Rose, Tayme Thapthimthong, Sahajak Boonthanakit, and Harrison Luna rounding out the group of friends and locals caught up in the cave dive. Jeff Wadlow directs, working within the tight physical geography of the cave to keep the group's dynamic under constant pressure.
Context & significance
Released in 2026, The Devil's Mouth sits in the survival-horror lane alongside other underwater and cave-set thrillers, leaning on real-world claustrophobia rather than supernatural spectacle. Its United States production places the story in a specifically Thai cave setting, using the geography itself — narrow tunnels, low visibility, limited air — as the source of tension. At 106 minutes, it is a tightly paced horror-thriller built for one sitting, with the cave setting doing much of the work usually left to a monster reveal.
Watching The Devil's Mouth on Ktime
The Devil's Mouth is available on K-Time with Persian dubbing and Persian subtitles, letting Farsi-speaking audiences follow the group's descent without losing tension to subtitle lag. The film's page is free to browse for anyone; streaming the film itself requires logging in with a free K-Time account, part of a viewing experience built around the Iranian diaspora.