SUBNAUTICA / BIOMES

Underwater Islands

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

QUICK REFERENCEFirst SubnauticaReviewed 2026-10-28Reference / noindex
Original Volpedia schematic category illustration
OVERVIEW

Understanding Underwater Islands

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

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

Use Beacons or landmark directions to avoid vertical disorientation.

COMMON MISTAKES

What to avoid

A high altitude over the sea floor still requires checking actual depth.

CONTINUE ON VOLPEDIA

Related topics and walkthroughs

GUIDESComplete Beginner Walkthrough

From Lifepod 5 to your first dependable underwater base

BASESExterior Growbed

An outdoor planter for cultivating suitable underwater or exterior plants.

VEHICLESSeaglide

A handheld underwater propulsion device useful for early navigation and escaping slow threats.

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.

BIOMESBulb Zone

A northeastern biome with bulbous blue plants and several hostile animals.

BIOMESCrash Zone

The wrecked Aurora region, containing dangerous terrain, debris and Reaper patrols.

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.