Games like Submarine Terror
Games like Submarine Terror include Subnautica, Subnautica 2, The Forest, Metro Exodus, and Subnautica: Below Zero. We matched them by the tags players give Submarine Terror on Steam (Submarine, Horror, Underwater, Atmospheric, and Open World): closest matches first, and among equally close ones the better-known games.

Subnautica
Shared: Horror · Underwater · Open World

Subnautica 2
Shared: Horror · Underwater · Open World

The Forest
Shared: Horror · Open World · Adventure

Metro Exodus
Shared: Open World · Atmospheric · Horror

Subnautica: Below Zero
Shared: Underwater · Horror · Open World

S.T.A.L.K.E.R. 2: Heart of Chornobyl - Standard Edition
Shared: Open World · Atmospheric · Singleplayer

Fallout 4
Shared: Open World · Atmospheric · Singleplayer

Firewatch
Shared: Atmospheric · Adventure · Open World

Ghostwire: Tokyo
Shared: Horror · Open World · Singleplayer

Iron Lung
Shared: Horror · Submarine · Atmospheric

Red Dead Redemption 2
Shared: Open World · Realistic · Adventure

Atomic Heart
Shared: Horror · Open World · Adventure

The Witcher 3: Wild Hunt — Remastered
Shared: Open World · Atmospheric · Singleplayer

Far Cry® 5
Shared: Open World · Action-Adventure · Realistic

Sons Of The Forest
Shared: Open World · Horror · Atmospheric

BioShock™ Remastered
Shared: Horror · Atmospheric · Underwater

Five Nights at Freddy's: Security Breach
Shared: Horror · Singleplayer · Multiple Endings

Contraband Police
Shared: Open World · Realistic · Singleplayer

Choo-Choo Charles
Shared: Horror · Open World · Singleplayer

The Long Dark
Shared: Open World · Atmospheric · Singleplayer

Cyberpunk 2077
Shared: Open World · Singleplayer · Atmospheric

Ready or Not
Shared: Realistic · Horror · Singleplayer

Stray
Shared: Atmospheric · Adventure · Singleplayer

Hogwarts Legacy
Shared: Open World · Singleplayer · Adventure