This is a 24 hour day/night cycle timelapse taken from Subnautica: Below Zero of the frozen leviathan at the Phi excavation site. 1 minute of real time equates to 72 minutes in-game, so a full 24 hour day takes 20 minutes. "Dive into a freezing underwater adventure. Below Zero is set in an arctic region of planet 4546B. As a scientist posted to a research station on the planet's surface, you are tasked with studying alien artifacts... The Vesper space station orbits high above you, sending supplies, and receiving samples you send up. When disaster strikes the research station, you must improvise to survive: Scavenge for resources, build shelter, and craft equipment." - GameFAQs