From Below to The Rig: 6 Best Deep Sea Thriller Shows of All Time, Ranked

The new Netflix miniseries Below taps into a fear that makes the ocean ideal for thrillers. We depend on it without really knowing what is swimming beneath us. It is the fear of the unknown, literally, as we really don’t know a lot about what’s in there. According to NOAA Ocean Exploration, only 28.7% of the ocean floor has been mapped as of April 2026. A submarine or oil platform offers limited protection when something goes wrong. If we didn’t know this before, we certainly know this after the Titan submersible disaster. It is hard to escape a sinking sub when the only exit is water. The deep sea doesn’t need monsters. It is scary enough on its own. 

These six shows, including Below, explore that vulnerability through sea monsters, military conspiracies, and ecological nightmares. Some venture underwater, while others bring danger offshore or into coastal communities. The shows are ranked from bottom to top based on factors like suspense, storytelling, and more. But regardless of the ranking, all these shows offer six compelling reasons to appreciate dry land.

6 The Deep Turns an Arctic Research Mission Into a Survival Nightmare

The BBC’s live-action The Deep follows the research submarine Orpheus beneath the Arctic ice, where its crew searches for microorganisms that could provide a new energy source. A previous expedition has disappeared. Apparently, that was insufficient reason to reconsider. Minnie Driver, James Nesbitt, and Goran Višnjić anchor the five-part series, but its strongest asset is the setting. Survival depends on equipment keeping an unforgiving environment outside. Convoluted plotting prevents it from ranking higher.

Where to Watch (US): The Roku Channel, Tubi

5 Below Unleashes Sea-Monster Horror on a Coastal Community

Josh Hartnett plays a fisherman in Below whose Newfoundland community faces a mysterious marine creature. The water that sustains the town becomes something its residents have reason to fear.

That dependence gives Below substance beyond the monster hunt. Staying ashore sounds sensible until you remember that fishing pays the bills. The creature threatens a community already struggling to survive.

Familiar horror devices hold Below back, but Hartnett gives it a compelling human center. Below‘s best moments make the town worth caring about before asking us to worry about what might drag its residents underwater. The series has been proven to be a hit if we go by Below‘s viewership figures.

Where to Watch (US): Netflix

4 The Swarm Turns the World’s Oceans Against Humanity

The Swarm, a German series, expands maritime terror to a global scale. Disturbing incidents involving marine life suggest a connected threat, forcing scientists to investigate what is happening beneath the surface.

The suspense comes from recognizing a pattern before understanding it. One strange encounter can be dismissed. Several, occurring worldwide, make comforting explanations difficult to maintain.

Adapted from Frank Schätzing’s novel, the series sometimes struggles with exposition and its sprawling ensemble. But its central idea is unnerving: humanity has treated the ocean as an inexhaustible resource, and something within it may have reached the end of its patience.

Where to Watch (US): The Roku Channel, Tubi

3 The Rig Finds Something Sinister Beneath the Seabed

An unnatural fog surrounds a North Sea oil platform, cutting its crew off from outside communication. The Rig places its supernatural mystery inside a workplace where isolation and danger are already routine. The crew must keep functioning as familiar procedures stop producing reassuring answers.

Arguments over leadership become more consequential when nobody can call for help. Iain Glen and Martin Compston ground the escalating threat. The environmental themes also give the location purpose: these people extract material from beneath the seabed. The possibility that their industry has disturbed something dangerous makes the platform an uncomfortable place to work. If you watched and loved Below, this is a nice alternative.

Where to Watch (US): Prime Video

2 Last Resort Sends a Nuclear Submarine Crew Into Open Rebellion

The USS Colorado receives orders to launch nuclear missiles at Pakistan. When its captain requests confirmation, the submarine comes under attack. Following procedure suddenly looks more dangerous than disobeying. Andre Braugher gives Captain Marcus Chaplin (who is not at all like Captain Holt, which would make the late actor legendary) the authority this explosive premise requires. We believe in his command, making his drastic decisions compelling.

Much of Last Resort unfolds on an island, but the submarine remains the crew’s bargaining power. Its weapons make their survival an international concern. Loyalty becomes a frightening practical question: whom should sailors obey when they suspect the people issuing orders?

Where to Watch (US): Prime Video, Fubo

1 Vigil Turns a Nuclear Submarine Into a Murder Scene

Vigil earns first place through its opening season. It sends detective Amy Silva, played by Suranne Jones, aboard a nuclear submarine to investigate a death. Her surroundings obstruct every step. Witnesses operate within a strict hierarchy, information is restricted, and the vessel’s mission continues regardless of her investigation.

Jones makes Amy’s persistence compelling, while Rose Leslie’s Kirsten Longacre pursues leads ashore. The submarine’s rules shape the mystery. Its confined spaces intensify suspicion, and its strategic importance means finding the truth could endanger far more than the killer. Another great alternative to Below.

Where to Watch (US): Peacock

Which sea-based thriller series tops your list, and what did we miss? Let us know in the comments.