Guide Hub

Subnautica 2 Halfmoon Guide

Where to find Halfmoon in Subnautica 2, how to scan it safely, what it means for routes, and what risks to avoid.

Halfmoon quick answer

Halfmoon is a fish entry most worth checking around Coral Gardens, Shallows. Scan it only when you still have a visible route home, enough oxygen to retreat, and a clear reason to add the creature to your current checklist.

FieldNotes
Main regionCoral Gardens, Shallows
RoleFish
Scan methodScan in shallow loops where oxygen fallback is simple.
UseFood planning and creature log
RiskLow

Location and route

Start from the closest safe landmark in Coral Gardens, Shallows, then make one pass to identify sightlines before committing to the scan. If the creature pulls you away from the marked route, cancel the attempt and return with more oxygen, better mobility, or a vehicle-supported path.

Uses and unlock value

Halfmoon is mainly useful for food planning and creature log. Record the biome, nearby plants, nearby minerals, and the tool loadout that made the scan safe; those notes are more valuable than a one-time sighting during Early Access.

Risk and scan notes

Good for food testing once digestive issues are solved. The safest scan window is after you stop moving, check oxygen, and confirm no larger threat is closing from behind. In co-op, one player should hold the landmark while another scans so the team does not lose the return line.

What to do next

Use this page with Fauna List and All Creatures, Interactive Map and All Locations, and Deep Dive Checklist.

Early Access note

This page is current for the May 20, 2026 Early Access build context and should be rechecked after major patches.