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

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...

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

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.

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.

The walls of the trench aren't rock. They're bone . Massive, fossilized rib cages of what must have been an ancient Leviathan class, easily three times the size of a Reaper. And wrapped around these bones? Vines. But not vines like the Creepvine. These pulse. They emit a soft, orange light that matches the wavelength of the Kharaa bacterium's secondary stage.

"This is Ryley Robinson, recording over the emergency channel. Designation: 71288.