New biomes have been added to Oxygen Not Included via the Aquatic Planet Pack. Here, you can find what each biome does and if they're worth it.
Game Rant on MSN
How to get the aquatic unknown duplicant in Oxygen Not Included
There's a special Duplicant that you can discover and unlock in Oxygen Not Included's Aquatic Planet Pack, and here's how.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results