71288 Subnautica _verified_ May 2026

This planet has secrets in its shallows. But its true nightmares are written in the bones of the deep.

I’m leaving a beacon here. Marker: 71288. If anyone finds this log—if the Sunbeam, or the trading platform, or literally any other vessel comes into orbit—do not approach this trench without a reinforced dive suit and a perimeter defense system.

I thought the Floating Islands were dangerous. I thought the Mushroom Forest was a maze. But this... this is something else. I followed a geological signal from the radio tower—a low-frequency hum that didn't match the usual volcanic tremors. It led me to a trench I've never seen before, located roughly 800 meters southwest of the Aurora’s drive core. 71288 subnautica

They look like Crabsquids, but their heads are elongated. Translucent. I can see smaller organisms swimming inside their skulls. A symbiotic hive mind. The PDA has no data on this species. I'm naming it: Umbracephalus trenchalis .

It just emitted a sonic pulse. My Seamoth's hull integrity dropped to 60%. I'm backing away slowly. Note to self: Do not use sonar. Do not use lights. They are attracted to electromagnetic fields. This planet has secrets in its shallows

There's something moving in the sediment.

Given that "71288" does not correspond to a standard in-game item, blueprint, or coordinate in Subnautica , it is treated here as a —a distress call or a research memo from a survivor on Planet 4546B. Aurora Survivor Log: Entry 71288 Status: Deep bioluminescent trench | Depth: 350m Subject: Geological anomaly & Leviathan class interaction Marker: 71288

Hypothesis: The precursors experimented here. They didn't just study the Sea Emperor. They tried to hybridize it. Whatever grew in this trench... it didn't survive. But its immune response did. The entire trench floor is covered in a gel that neutralizes small infections on contact. If I could synthesize this...