What makes this cave different
A vast underwater trench beneath non-warm ocean biomes, where dim light, lost ruins and deep-sea creatures transform exploration into a different kind of survival.
What to look for
The seabed features Abyssmarine, Muck, ruins and Deep Ones. Submarines are a notable exploration mechanic, but they do not make the trench risk-free.
How to prepare
Plan underwater breathing, illumination and a return route. Avoid provoking Deep Ones unnecessarily: their faction includes trade and reputation mechanics.
Resources and rewards
Deep-sea materials, ruin artefacts and unusual underwater items.
How do I find this particular biome?
Use a matching Cave Tablet to create a Cave Codex and Cave Biome Map. The map targets a specific biome type, but discovery depends on your world and settings.
