Biome Hazard Mapper
Visualize threat levels for 12+ Subnautica 2 biomes. See predator density, environmental danger, best dive times, equipment recommendations, and save your own personal safety notes — all backed by community-tested data.
Filter Biomes
Hazard Level
Depth Range
Primary Resource
Biome Grid
Biome Comparison
Select 2-3 biomes in the grid to compare threat vectors side-by-side. Click "Add to Compare" after selecting biomes.
Personal Threat Notes
Track your personal experiences per area. Notes are saved in your browser (localStorage key sn2_biome_notes). Mark your most-feared biomes for quick access.
Frequently Asked Questions
How is the hazard level calculated?
Each biome receives a 1-5 hazard score weighted across five dimensions: predator density, environmental danger, oxygen/crush risk, visibility, and escape item availability. The composite score and color coding (green/lime/yellow/orange/red) combine to show overall threat level. Click any biome card to see the radar breakdown.
Why are some biomes safer at night?
Many aggressive predators like Stalkers and Bonesharks are less active during Subnautica 2's night cycle, while passive species become more visible. Dark conditions do reduce visibility, so the best dive time balances predator dormancy with environmental clarity. Check the "Best Dive Time" on each biome card for community recommendations.
Which biomes require a Radiation Suit?
The Crash Zone (around the Aurora) and any biome touching the Aurora's radiation leak requires a Radiation Suit. Lost River also benefits from one due to ambient sulfur. Inactive Lava Zone proximity may also expose players to ambient heat, requiring a PRAWN Thermal Module rather than a Radiation Suit.
Can I export my personal notes?
Personal biome notes are saved in your browser's localStorage under the sn2_biome_notes key. Use your browser's profile sync, or open DevTools → Application → Local Storage to copy the JSON payload and re-paste on another device. Notes persist across sessions unless you clear site data.
Plan Safe Routes
Route Planner — Path Your Dives
Once you know which biomes are dangerous, plan the safest path with depth-aware waypoints and gear-checkpoint sequencing.
Load Out For Threat
Vehicle Loadout Optimizer
Match Seamoth, PRAWN, and Cyclops modules to the specific hazards of each biome. Pre-flight checklist for any deep dive.
Wrong hazard rating or missing biome?
Hazard data is tuned for the current EA patch. Report mismatches and we'll update the threat map.
Report an Error