User blog comment:Gush958/What is the scariest place in Subnautica?/@comment-31528721-20170316201131

Active lava zone. Once I got trapped there while trying to catch a Lava Larva for aesthetic purposes at my base. The moment I got one with my propulsion cannon, ten Lava Lizards rushed at me. I eventually found safety, but guess what? The freaking Sea Dragon Leviathan appeared out of nowhere and attempted to eat me! Luckily, I escaped with my Cyclops and Lava Larva. The Lava Larva's name is Jeff.

Other than that biome, I think that the Sea Treader's Path is straight up creepy. Going in murky water and then bumping into a massive giraffe-fish is really creepy for me.