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Games like Thalassa: Edge of the Abyss | IndieDex

Thalassa: Edge of the Abyss
Games like Thalassa: Edge of the Abyss

Find the Steam hidden gems

single-players with secrets you find without a guideor

Games like Thalassa: Edge of the Abyss

A melancholic first-person underwater mystery about investigating a sunken ship to uncover the fate of your crew, with a slow-burn emotional story.

Lazaret
A single-player first-person horror adventure about investigating a distress signal from a ship missing for four years, offering puzzle-driven, manageable scares in roughly nine hours.
2024-02-20
- First person
- Puzzle

Adventure

Horror

Indie

Harold Halibut cover art

Harold Halibut

A slow-paced claymation narrative adventure about exploring a submerged spaceship city and searching for home, with a whimsical, cozy tone and roughly 14 hours of story-rich walking and conversation.

2024-04-16

Science fiction
Adventure
Indie
Side view
Simulator
Mystery
Drama

Stirring Abyss cover art

Stirring Abyss

A single-player tactical squad RPG with underwater exploration, survival mechanics, and Lovecraftian dread; a small reviewer sample logged roughly 16–22 hours.

2020-10-29

Adventure
Horror
Strategy
Third person
Tactical
Indie
Role-playing (RPG)

Beyond Blue cover art

Beyond Blue

A compact ~4-hour underwater narrative adventure about exploring ocean depths and marine life as a female protagonist, with a chill yet emotional tone.

2020-06-11

Action
Adventure
Third person
Indie
Simulator
Kids

The Wreck cover art

The Wreck

A single-player 3D visual novel about a failing screenwriter reliving a pivotal day through choices, with a dark, emotional psychological story and a roughly 7-hour runtime.

2023-03-14

Puzzle
Adventure
Third person
Indie
Mystery
Point-and-click
Drama
Visual Novel

Eternal Threads cover art

Eternal Threads

A single-player, first-person post-apocalyptic puzzle adventure about investigating disasters by manipulating timelines, with meaningful choices and a roughly 9-hour story.

2022-05-19

Action
First person
Puzzle
Adventure
Survival
Indie

Under The Waves cover art

Under The Waves

A melancholy, story-driven North Sea diving adventure about grief, isolation, and a life-changing choice, with exploration and a submarine, running about 9-11 hours.

2023-08-28

Action
Science fiction
Adventure
Third person
Indie

CRUSH DEPTH cover art

CRUSH DEPTH

A tight ~3-hour first-person underwater sci-fi horror about a doomed salvage operation, with puzzle-solving and fleeing a monstrous threat in a dread-soaked atmosphere.

2025-11-21

Action
First person
Science fiction
Adventure
Horror
Indie
Simulator

Deep Beyond cover art

Deep Beyond

A short, story-rich first-person interactive thriller about a sea explorer investigating her father's disappearance, with engaging visuals and voice acting.

2024-05-15

Action
First person
Puzzle
Adventure
Third person
Indie
Simulator

Panthalassa cover art

Panthalassa

An atmospheric single-player point-and-click puzzle adventure about an AI exploring an underwater alien world, with a roughly six-hour story driven by otherworldly technology and mystery.

2026-05-17

Adventure
Indie

Narcosis cover art

Narcosis

A tense ~3-hour underwater survival horror in which an industrial diver struggles with oxygen, sanity, and the dark seafloor to reach the surface.

2017-03-28

Action
First person
Adventure
Horror
Survival
Indie
Mystery
Virtual Reality

Cthulhu: The Cosmic Abyss cover art

Cthulhu: The Cosmic Abyss

A single-player Lovecraftian investigation game set in a deep-sea mining station, focusing on atmosphere, clue-finding, and puzzle-solving, with mixed reviews over its mechanics.

2026-04-16

First person
Science fiction
Thriller
Adventure
Horror
Mystery