SUBNAUTICA 2 GUIDEDeep-sea field manual
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Mountain Island

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Mountain Island is a large, fog-shrouded island biome located above the Mountains. It features rich mineral resources in its caves, an Alien Arch, and serves as a key location for story progression via the Quarantine Enforcement Platform.

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Mountain Island

MountainIslandHeaderImage

FeatureDetails
TypeIslands
Depth Range0 - 155 meters above sea level
Temperature Range20.5°C - 30.3°C
Harvesting NodesShale Outcrop
Points of InterestQuarantine Enforcement Platform, Alien Arch, Alien Arch Cache, Mountains Caves
Cave Entrance Coordinates335, 10, 1025
MusicViolet Beau

The Mountain Island is a large island biome located on top of a mountain range in the Mountains. It is situated 1000m northwest of the wreck of the Aurora and is adjacent to the Bulb Zone, Kelp Forest, Mushroom Forest, and the Underwater Islands. The island also harbors the Quarantine Enforcement Platform at its northern tip.

The island is shrouded by fog, making it invisible until one is relatively close. However, players can receive coordinates for its location from the Sunbeam.

Description

The Mountain Island is characterized by rocks of various sizes and a fairly large mountain in the center, surrounded by an extensive shoreline. The island is connected to the Mountains Caves, with entrances accessible from both underwater and on land.

The Mountain Island can be fully explored on foot, featuring a small variety of flora such as Bulbo Trees, bioluminescent grass, and Pink Caps, as well as wildlife like Speckled Rattlers. Unlike the Floating Island, this island is part of a continental shelf.

Exploration and Resources

The path to the summit is marked by Precursor technology; along the path, two Purple Alien Tablets can be found. Near the summit of the island is a Principal Alien Arch Cache connected to the Floating Island Arch.

Some of the caves lead to a lagoon, which houses many types of flora and connects to the island's base.

Notable Wildlife:

Notable Flora:

Resources:

Notes

  • The caves leading to the Alien Arch are extremely rich in rare resources whose acquisition normally requires exploring much more dangerous biomes. Shale Outcrops and Lithium in particular are abundant, providing easy access to Gold, Lithium, and Diamonds for anyone capable of handling a large number of Cave Crawlers in the area.
  • If the player opens their PDA in the direction of the Mountain Island from anywhere on the map (like using a spyglass), the clouds shrouding the island will glow a bright white. This shows the player which clouds are real or fake, revealing the exact location of the island. This method works regardless of which PDA menu is selected, but only during daytime and while above the surface. It also works on the clouds shrouding the Floating Island.

Mountain Island Overview Mountain Island Overview

Ditto, at night Ditto, at night

Main part of the Mountain Island's beach Main part of the Mountain Island's beach

Birds-eye view of the Mountain Island's beach Birds-eye view of the Mountain Island's beach

Lagoon Entrance, found upon the beach Lagoon Entrance, found upon the beach

Underwater Entrance, leading to the Lagoon Underwater Entrance, leading to the Lagoon

A view inside the underwater caves A view inside the underwater caves

A small underwater cave at the base of the Mountain Island A small underwater cave at the base of the Mountain Island

Mountain Island Lagoon Overview Mountain Island Lagoon Overview

Mountain Island Lagoon from a small cave above Mountain Island Lagoon from a small cave above

Mountain Island Lagoon from underwater Mountain Island Lagoon from underwater

A pathway leading up the side of the Mountain Island to the cave system A pathway leading up the side of the Mountain Island to the cave system

A pathway leading from the Cave System to the top of the mountain A pathway leading from the Cave System to the top of the mountain

Ditto, opposite side Ditto, opposite side

The entrance to the cave system The entrance to the cave system

A view inside the caves. A view inside the caves.

The caves of the island are full of Shale Outcrops and Lithium The caves of the island are full of Shale Outcrops and Lithium

A view of the Quarantine Enforcement Platform A view of the Quarantine Enforcement Platform

The cave leading to the Arch The cave leading to the Arch

The Alien Arch of the Mountain Island, unpowered The Alien Arch of the Mountain Island, unpowered

Ditto, powered Ditto, powered

Skyrays flying above the Mountain Island Skyrays flying above the Mountain Island

Concept Art of the Mountain Island, along with the Quarantine Enforcement Platform Concept Art of the Mountain Island, along with the Quarantine Enforcement Platform

Bugs

  • On Xbox, the clouds shrouding the island aren't visible, making it quite hard to locate the island.

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