Grand Reef

The Grand Reef is a deep biome in Subnautica which covers a large area in the southern portion of The Crater.

Description

The Grand Reef is home to a limited amount of fauna, including the large bottom-dwelling Sea Treader Leviathans, as well as two massive Ghost Leviathans. It is also known for its unique types of flora, from the many luminous Anchor Pods to the peculiar Membrain Trees. There are multiple entrances to small caves known as the Grand Reef Caves in the Grand Reef. Scattered deep within the Grand Reef are multiple hydrothermal vents.

Below this area, the player can find the Deep Grand Reef, a large system of caverns featuring similar types of flora and fauna, with the addition of Crabsquids and Jellyrays and the absence of the Sea Treader Leviathans.

Rubies and Gel Sacks are commonly found in the Grand Reef, along with many other rare materials and fragments. Due to the abundance of hazardous fauna, depth, and general difficulty of navigation, exploring this biome early on without adequate gear is not recommended. An easy way to get to this biome is to use the Floating Island as a landmark for its location.

Story Spoilers

One of the five Sea Emperor Juveniles can be found here after the Sea Emperor Leviathan Eggs have been hatched. A Degasi Seabase can also be found in the deep section of this biome.

Points of Interest

• Large Wrecks: Located at coordinates (-284, -250, -850) and (-865, -430, -1420).
• Thermal Vent Clusters: Located at (-375, -203, -729), (-979, -393, -1372), and (-447, -350, -1264).
• Grand Reef Caves Entrance: Located at (-756, -430, -1444).
• Deep Grand Reef Entrances: Multiple openings located around (-840, -450, -1335), (-710, -375, -1190), (-670, -400, -1280), (-650, -390, -1100), (-640, -390, -1205), (-510, -420, -1220), and (-460, -440, -1020).
• Alien Vent Entrance Point: Located at (-940, -335, -1220).

Contents

Data Boxes (Found in Wrecks)

• Cyclops Decoy Tube Upgrade
• Cyclops Depth Module MK1
• Cyclops Docking Bay Repair Module
• Cyclops Sonar Upgrade
• Cyclops Thermal Reactor Module
• Repulsion Cannon

Resources & Materials

• Copper Ore
• Diamond
• Gel Sack
• Gold
• Large Copper Deposit
• Large Quartz Deposit
• Lead
• Lithium
• Quartz
• Ruby
• Salt Deposit
• Silver Ore
• Spadefish Egg
• Titanium
• Uraninite Crystal

Fauna

• Bladderfish
• Boneshark (along the Crag Field border)
• Crabsquid (in deeper areas)
• Eyeye
• Ghost Leviathan
• Hoopfish
• Jellyray (in deeper areas)
• Mesmer (along the Crag Field border)
• Peeper
• Reefback Leviathan (above the Grand Reef)
• Sea Treader Leviathan
• Shoal of Fish
• Spadefish
• Warper

Flora

• Anchor Pods
• Gel Sack
• Membrain Tree
• Purple Pinecone

Fragments (Found in Wrecks)

• Moonpool Fragment
• Thermal Plant Fragment
• Prawn Suit Drill Arm Fragment
• Prawn Suit Grappling Arm Fragment
• Scanner Room Fragment

Decorations (Found in Wrecks)

• Bench
• Command Chair
• Composite Plant Pot
• Desk
• Office Chair
• Plant Shelf
• Quilted Double Bed
• Swivel Chair
• Trash Can
• Wall Shelves

Gallery

Overview, day

Overview, night

Flora found in the Grand Reef

A shallower area of the Grand Reef

One of the smaller rock arches in the Grand Reef

A large rock arch in the Grand Reef

A deeper area of the Grand Reef

Thermal Vents in the Grand Reef

An entrance to the Grand Reef Caves

A Wreck located in a shallower area of the Grand Reef

A Wreck located in a deeper area of the Grand Reef

Sea Treader Leviathans in the Grand Reef

A small canyon in the Grand Reef

A large canyon, leading to an entrance to the Deep Grand Reef

A large opening into the Deep Grand Reef

A small opening into the Deep Grand Reef

A small hole in the ground leading into the Deep Grand Reef

A canyon-like area in the Grand Reef

The highest point of the Grand Reef

A crag-like formation 525 meters down, bordering the Crater Edge

A fissure at the south-east of the Biome, its bottom is the deepest point at 620 meters

The Ghost Leviathan located in the western area of the biome

The Ghost Leviathan located in the eastern area of the biome

Transition with the Crag Field

Transition with the Kelp Forest

Transition with the Sparse Reef

Transition with the Sea Treader's Path

Concept art

Trivia

• In earlier builds, the Grand Reef had large pillar-like spikes, some of which were visible above the surface. These were removed and was explained to be temporary. However, the concept of them may have been used for inspiration of the Crag Field. Another reason for their removal is that they had bad models and were not destructible.
• Certain structures have curious house-like caverns, very reminiscent of grotto-homes in primitive cultures. There used to be several of these large "buildings", however they were removed during development.
• The Grand Reef is the third largest biome in Subnautica.
• There are actually only 3 types of Flora in the Grand Reef: Anchor Pods, Gel sacks, and Membrain Trees. There are numerous species of unnamed seagrasses however which serve only as decoration.
• The Grand Reef is one of the two biomes in the game to house two different leviathans: The Ghost Leviathan and the Sea Treader Leviathan. The other one being the Dunes, with Reaper Leviathans and Reefback Leviathans.
• The Grand Reef is however the only biome to house three different types of leviathans: The Ghost Leviathan, the Sea Treader Leviathan and the Reefback Leviathan.
• The Grand Reef was planned to house a Warp Gate Cache that linked to the Primary Containment Facility. This, however, was scrapped.