SUBNAUTICA / BIOMES

Mountain Island

An island tied to the alien-installation storyline.

QUICK REFERENCEFirst SubnauticaReviewed 2026-10-28Reference / noindex

OVERVIEW

Understanding Mountain Island

An island tied to the alien-installation storyline.

This is an original reference for the first Subnautica. Your current depth rating, oxygen, available tools and navigation route determine when an objective is practical. Follow actual in-game PDA and Fabricator information for any values that vary by version.

PRACTICAL APPROACH

How to use this information

Approach prepared for cave navigation and the possible threat of nearby deep water.

COMMON MISTAKES

What to avoid

Rushing its underground sections can spoil narrative discovery.

CONTINUE ON VOLPEDIA

Related topics and walkthroughs

BIOMESMountains

Rocky biome near the island, notable for challenging predator encounters.

BIOMESFloating Island

An above-water island with abandoned Degasi structures and growable plants.

BIOMESUnderwater Islands

A biome of suspended islands, caves and varied wreck exploration opportunities.

GUIDESDegasi Habitats And Story Logs

Trace the Degasi expedition from island to deep sea

WRECKSDegasi Seabase — Floating Island

The abandoned surface settlement that introduces Degasi exploration records and useful plants.

BIOMESBlood Kelp Trench

A narrow deeper bloodvine region offering one possible route toward advanced zones.

BIOMESBlood Kelp Zone

A dark biome with white bloodvine and connections toward Lost River.

Back to Maps & Biomes

Independent Volpedia editorial encyclopedia about the first Subnautica, reviewed 2026-10-28. Unaffiliated with Unknown Worlds Entertainment. Category illustrations are original diagrams, not in-game maps, screenshots or exact creature portraits. No fabricated damage statistics, spawn probabilities or detailed map coordinates. References are documented privately and not shown as outbound research buttons.