Grand Reef
A breathtaking deep-water biome with bioluminescent flora. Dangerous but resource-rich.
Quick Info
Overview
The Grand Reef is a sprawling deep-water biome where bioluminescent flora paints the cold darkness in shifting bands of light. Massive coral formations and glowing plant life cling to steep drop-offs, creating one of the most visually striking regions in Subnautica 2. At 200 to 500m, it sits firmly in vehicle territory, well beyond the reach of casual free-diving.
Beauty aside, the reef is dangerous. Bonesharks patrol the glowing canyons and will attack divers and vehicles on sight, and the cold depth quickly punishes anyone without a Reinforced Suit. A Seamoth is effectively mandatory, both to withstand the pressure and to escape aggressive fauna. The reward for braving all of this is some of the richest deep resource density in the game.
Deep wrecks scattered across the seafloor contain high-value fragments, while resource nodes yield rare materials that only appear at these depths. The Grand Reef is a natural progression target after the Mushroom Forest and a gateway to the game's deepest zones. Approach it prepared, treat the Bonesharks with respect, and it becomes one of the most profitable biomes to harvest.
Resources Found Here
The Grand Reef yields deep resources and rare materials found nowhere shallower. Lithium appears among the deep nodes, and the seafloor wrecks provide valuable scannable fragments alongside the raw materials you harvest.
Creatures Found Here
The Grand Reef's signature threat is the Boneshark, an aggressive deep predator that attacks divers and vehicles alike. The rest of the fauna consists of ambient deep-sea life adapted to the cold, dark water.
Exploration Tips
Use a Seamoth
The reef's depth and predators make free-diving impractical. A Seamoth handles the pressure and gives you a fast escape from Bonesharks.
Wear a Reinforced Suit
The cold depth and predator hits add up fast. A Reinforced Suit significantly reduces damage and lets you survive a Boneshark encounter.
Repair between encounters
Keep a repair tool on hand for both your suit and your Seamoth. Patching up after each Boneshark run keeps small damage from snowballing.
Scan deep wrecks first
Wreck fragments are the reef's highest-value haul. Prioritise scanning them early in each dive, then harvest materials on the way out.
Points of Interest
Deep Wrecks
Large wrecks rest on the deep seafloor, each holding high-value scannable fragments for advanced blueprints. They are the main reason to brave the reef.
Resource Nodes
Glowing resource nodes cling to the reef walls and floor, yielding rare deep materials and Lithium that do not spawn in shallower biomes.
Map Locations
The Grand Reef lies below the Mushroom Forest at deep depths. Use the interactive map to locate deep wrecks, mark Boneshark patrol zones, and plan Seamoth-friendly descent routes.
View on Interactive Map →Related Biomes
Frequently Asked Questions
How dangerous is the Grand Reef?
Moderately dangerous. Bonesharks patrol the reef and attack divers and vehicles on sight, and the depth itself is punishing without a vehicle. It is less lethal than leviathan territory, but it is unforgiving for unprepared divers, so treat it with respect.
What equipment do I need for Grand Reef?
A Seamoth for depth and quick escapes, plus a Reinforced Suit to survive predator hits and the cold. Bring a repair tool to patch your suit and vehicle between encounters, and an upgraded oxygen tank for any free-diving you do near the wrecks.
What resources are in Grand Reef?
Deep resources and rare materials that only spawn at these depths, including Lithium among the deep nodes. The seafloor wrecks also provide high-value scannable fragments, making the reef one of the most profitable biomes for prepared divers.
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