Games like There's Nothing Down There
Games like There's Nothing Down There include Five Nights at Freddy's: Security Breach, Firewatch, Scanner Sombre, The Exit 8, and Five Nights at Freddy's: Secret of the Mimic. We matched them by the tags players give There's Nothing Down There on Steam (Horror, Submarine, Adventure, Exploration, and First-Person): closest matches first, and among equally close ones the better-known games.

Five Nights at Freddy's: Security Breach
Shared: Horror · First-Person · Exploration

Firewatch
Shared: Adventure · First-Person · Exploration

Scanner Sombre
Shared: Horror · Exploration · Adventure

The Exit 8
Shared: Horror · Exploration · Walking Simulator

Five Nights at Freddy's: Secret of the Mimic
Shared: Horror · Adventure · First-Person

Iron Lung
Shared: Horror · Submarine · Adventure

Escape the Backrooms
Shared: Horror · First-Person · Exploration

Subnautica
Shared: Horror · Exploration · Adventure

What Remains of Edith Finch
Shared: First-Person · Exploration · Adventure

The Forest
Shared: Horror · Adventure · First-Person

Subnautica 2
Shared: Horror · Exploration · Adventure

Outlast
Shared: Horror · First-Person · Adventure

Layers of Fear (2016)
Shared: Horror · First-Person · Walking Simulator

PEAK
Shared: Adventure · Exploration · First-Person

Lethal Company
Shared: Horror · First-Person · Exploration

Amnesia: A Machine For Pigs
Shared: Horror · First-Person · Walking Simulator

September 7th
Shared: Horror · Exploration · First-Person

Among the Sleep - Enhanced Edition
Shared: Horror · Adventure · First-Person

Still Wakes the Deep
Shared: Horror · First-Person · Adventure

Subnautica: Below Zero
Shared: Horror · Exploration · Adventure

Fears to Fathom - Ironbark Lookout
Shared: Horror · Exploration · Adventure

Outer Wilds
Shared: Exploration · Adventure · Horror

The Beast Inside
Shared: Horror · Adventure · First-Person

Valley
Shared: Adventure · Exploration · First-Person