Submarine thrillers live or die by claustrophobia, and Below suffocates in the best possible way. Netflix’s October surprise drops us into the belly of a military submarine where the crew begins experiencing strange phenomena — mechanical failures that defy explanation, sounds that have no source, and a casualty list that keeps growing in ways nobody can account for. Is something supernatural haunting the vessel, or is the pressure of deep water simply breaking the men inside it?

Director’s control here is precise. The confined quarters never feel like a limitation — they feel like a trap, which is exactly the point. Cinematography uses the narrow corridors and low ceilings to create a sense of inescapable dread that never fully releases. Every scene feels like the walls are moving inward by centimeters.

The ensemble cast anchors the tension. The commanding officer holds the film together with a performance that cycles through authority, doubt, and something close to madness without ever losing credibility. His crew follows suit, each actor finding specific texture in roles that could easily blur together. When the paranoia spreads — when crewmembers start accusing each other, hiding things, making decisions that cost lives — it feels earned rather than manufactured.

What Below does best is keep its mystery genuinely mysterious. There are explanations offered, then undercut. There are moments where the supernatural seems confirmed, then questioned. The film trusts its audience to sit with uncertainty, which is rarer than it should be. The final act doesn’t neatly resolve everything, and that restraint is the right call. Some doors should stay closed.

Minor issues: a few supporting characters are thinner than they need to be, and one subplot involving radio communications feels undercooked. But these are small complaints against a film that largely delivers on its premise. Below is the kind of thriller that rewards patience — it builds slowly, methodically, and by the time it erupts, you’ve been wound so tight that the release is almost physical.

Stream it with the lights off and tell someone where you are.

Rating: 8/10

Below is now streaming on Netflix.