The alien observatory door in Subnautica 2 is fairly close to the Alien Ruins biome/marker, which is a key objective once you ...

The comb in the caves 100 meters west of the Alien Ruins, about 167 meters deep, is a juvenile comb — so it has no mutations to offer you even when you do clear it. When you approach the canker blooms ...

Here's how to fix the Translation Failed notice when you hover over the alien symbols in Subnautica 2.

Brave the ocean beyond.