In 1972, an old military submarine was donated for scientific research. It was to be used for observing and collecting data about the sea life of the Pacific ocean, specifically the whales. An issue arose though, only one person agreed to be locked underwater in a floating tin can, only one researcher boards the submarine, alone in the dark depths of the ocean.
https://v-vix.itch.io/dark-depths
Dark Depths is a short 20-40 minute horror-themed whale watching simulator in an early 3D games (Quake, GoldenEye, Deus Ex) style graphics. It's available for free (with optional donations) on Windows and Linux (with a bonus of behind the scenes docs if you donate at least 4$).
(Also, does anybody know why I can't see the game when I try to put it's name in the search bar? it's been 2 days and I'm beginning to worry that something broke 😰)