Much like it's predecessor, the player can craft a scanner and scan creatures within the environment to read more about them and find out what it can and can't do. Brooks is the voice actor for Robin Ayou. The player needs to scavenge for food and water, craft tools to aid their survival and repair items and find out the truth on both land and underwater.
Taking place two years after the original Subnautica and in an Arctic setting, the player controls a female protagonist by the name of Robin who is tasked to handle experiments on Planet 4546B whilst her older sister Sam is observing from above in a space station.