Games like The Trench
Games like The Trench include SOMA, Iron Lung, Outlast, Subnautica 2, and Poppy Playtime. We matched them by the tags players give The Trench on Steam (Horror, Submarine, Underwater, Survival Horror, and Lovecraftian): closest matches first, and among equally close ones the better-known games.

SOMA
Shared: Horror · Atmospheric · Survival Horror

Iron Lung
Shared: Horror · Submarine · Atmospheric

Outlast
Shared: Horror · Survival Horror · Atmospheric

Subnautica 2
Shared: Horror · Underwater · Survival Horror

Poppy Playtime
Shared: Horror · Survival Horror · Mystery

Lethal Company
Shared: Horror · Survival Horror · Atmospheric

The Forest
Shared: Horror · Survival Horror · Adventure

Resident Evil Requiem
Shared: Horror · Survival Horror · Action

Alien: Isolation
Shared: Horror · Survival Horror · Atmospheric

Amnesia: The Dark Descent
Shared: Horror · Survival Horror · Atmospheric

Barotrauma
Shared: Submarine · Horror · Survival Horror

Subnautica
Shared: Horror · Underwater · Adventure

Backrooms: Escape Together
Shared: Horror · Survival Horror · Atmospheric

Dagon: by H. P. Lovecraft
Shared: Horror · Lovecraftian · Atmospheric

Resident Evil Village
Shared: Horror · Survival Horror · Action

Inside the Backrooms
Shared: Horror · Survival Horror · Adventure

Resident Evil 7 Biohazard
Shared: Horror · Survival Horror · Atmospheric

Darkwood
Shared: Horror · Survival Horror · Adventure

SIGNALIS
Shared: Survival Horror · Atmospheric · Lovecraftian

Amnesia: A Machine For Pigs
Shared: Horror · Atmospheric · Mystery

Still Wakes the Deep
Shared: Horror · Lovecraftian · Atmospheric

Five Nights at Freddy's: Secret of the Mimic
Shared: Horror · Adventure · Survival Horror

Penumbra Overture
Shared: Horror · Survival Horror · Adventure

Five Nights at Freddy's: Security Breach
Shared: Horror · Survival Horror · Adventure