Abyss of Neptune

Underwater survival horror with nonlinear exploration, puzzles, and creature encounters

Abyssmal Games, Synodic Arc · Published by Synodic Arc · Released Apr 26, 2021

Reviews: Mixed; 68% of 257
Recent reviews: Not enough recent
Players: 0; daily peak, Oct 28, 2026
Steam Deck: Untested
Last update on Steam: 4 years ago; Mar 22, 2022
Minimum PC: GeForce GTX 1050; 8 GB RAM · 6 GB disk; Full requirements

What is Abyss of Neptune?

This free first-person survival horror game takes place beneath the Bermuda Triangle, where you investigate a mysterious signal. You navigate its nonlinear underwater environment using a diving suit’s jet booster, flashlight, and gadgets, scavenging, solving puzzles, and hiding from or fighting creatures.

For you if...

+you enjoy uncovering mysteries through exploration and puzzles
+you prefer horror games you can finish relatively quickly

Not for you if...

−you want relaxed exploration without threats or combat

What players say

68% of 257 reviews are positive

Players praise the underwater scenery, atmosphere, and sound design. Recent reviews criticize awkward combat and movement, with the final fight drawing particular frustration.

Screenshots and trailer

Abyss of Neptune system requirements

Minimum: GeForce GTX 1050, 8 GB RAM, 6 GB of disk space.

As published by the developer.

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Minimum

OS: Windows 10 (64-bit)
Processor: Intel Core i3-4160 @ 3.60GHz or equivalent
Graphics: NVIDIA GeForce GTX 1050
Memory: 8 GB RAM
Storage: 6 GB available space
DirectX: Version 11

Does Abyss of Neptune have co-op or multiplayer?

No: single-player only, no multiplayer modes declared. With Remote Play Together, one copy is enough to play the local modes online with friends.

Does Abyss of Neptune run on Steam Deck?

Untested Not yet tested by Valve on Steam Deck.

PC version details

DRM: None declared on Steam
Controller: Full controller support
Platforms: Windows
Achievements: 12
Steam features: Family Sharing
Languages: Full audio: English. Text only: Spanish - Latin America, Spanish - Spain.

Does Abyss of Neptune use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 27, 2026. How to filter AI games on Steam