About
SUBSTRATUM is a single player survival survival game. It was developed by Hot Diggity Dog and was released on December 24, 2025.
A mysterious vortex dragged your sub into an uncharted underwater cave system. In total darkness, your only way to see is by firing sonar probes... but your supply is finite. Fire probes to reveal walls, enemies, and salvage from those who came before. Scavenge equipment to survive, harvest old tech for more probes, and carefully navigate treacherous passages. One wrong move and your hull breache…
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Frequently Asked Questions
SUBSTRATUM is a survival survival game.
SUBSTRATUM is available on Web Browser.
SUBSTRATUM was released on December 24, 2025.
SUBSTRATUM was developed by Hot Diggity Dog.
SUBSTRATUM is a single player game.
Similar games include Feed the Deep, Duskers, Heart Keeper, Sonar Scout, Abandon Ship and others.