Subnautica
Unknown Worlds (final version 2018)
Subnautica is an open world survival action-adventure video game developed and published by Unknown Worlds Entertainment.
In it, players are free to explore the ocean on an alien planet after their spaceship, the Aurora, crashes on the planet's surface. The player must collect resources and face creatures to survive.
Take care:
It is TERRIBLY ADDICITVE!
Subnautica: Below Zero
Unknown Worlds (final version 2021)
Fortunately, there is a second game based on the same engine - but with even more ways to do stuff...
Warning:
As addictive as the first one!
https://en.wikipedia.org/wiki/Subnautica