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This article is about the Inactive Lava Zone. If this is not what you are looking for, see Lava Zone (Disambiguation).

The Inactive Lava Zone is a cavernous biome located 900 meters below the surface. It is the second deepest biome and the penultimate area in Subnautica.


The Inactive Lava Zone is characterized by large, arching structures and walls of hardened lava with occasional steaming lava streams. It is composed of two distinct areas and can be found at 900 to 1300 meters down, well below the limit of a Seamoth (even when equipped with a Seamoth Depth Module MK3) - making an upgraded Cyclops and Prawn Suit the only vehicles to be able to navigate through it. The Player must be extremely careful when navigating this biome, as touching the lava on the floor of the Inactive Lava Zone can completely deplete the player's health in seconds and the temperature applies constant damage unless the player has a Reinforced Dive Suit. It also contains the rare resource Kyanite, which is used in crafting some Prawn Suit and Cyclops modules.

The Inactive Lava Zone can be accessed through two entry points located in the western and eastern wings of the Lost River, being the Mountains Corridor and the Tree Cove, respectively.

At the center of the Inactive Lava Zone is a large chamber, with occasional veins of lava and spires of hardened rock. Titanium, Copper Ore and Ruby can be found on these spires occasionally. Lava rivers can be found in narrow corridors around the area with Silver Ore, Crystalline Sulfur and Diamond found scattered around them. A large structure called the Lava Castle can be found in the middle of the chamber, with small, partially-collapsed volcanic domes scattered all over the floor of the chamber itself. These can have some Ruby, Magnetite, and Gold on them. Many skeletal remains of Reaper Leviathans can be found here due to the Sea Dragon Leviathans infrequently coming to the surface to hunt them and bring them to the central chamber to feast.

Near the Lava Castle, there are multiple lava falls, leading directly into the Lava Lakes. They can be found easily by following the streams of molten lava on the floor of the Chamber.

Lava Pit

The Lava Pit is a large pit found on the outskirts of the main chamber. The walls of the pit are covered in large grooves, at the northern edge of the pit one of the grooves acts as an entrance to the Lava Lakes The lighting in this area is much brighter than the surrounding areas of the Inactive Lava Zone. It resembles a volcanic dome and most of the resources contained within are Diamond, Gold, Lithium, Titanium, Quartz, Lead, Magnetite and Large Uraninite Deposits.


<gallery widths="200" spacing="small"> ILZ1.jpg|Overview of the Inactive Lava Zone Chamber ILZ_Chamber_Lava_Castle.png|The Lava Castle ILZ_Chamber_Magma_Forest.png|The "Magma Forest" in the Inactive Lava Zone Chamber ILZ_Chamber_Lava_Domes.png|Lava Domes in the Inactive Lava Zone Chamber ILZ_Chamber_Lava_River.png|A lava river in the Inactive Lava Zone Chamber ILZ2.jpg|Formations of solidified lava in the Inactive Lava Zone Chamber ILZ_Reaper_Skeleton.png|A Reaper Leviathan Skeleton in the Inactive Lava Zone Chamber ilzgeysers.jpg|Small Lava Geysers in the Inactive Lava Zone Chamber ILZ_Chamber_Cave.png|An entrance to a cave in the Inactive Lava Zone Chamber LRLZ.jpg|The point of transition from the Lost River to the Inactive Lava Zone Inactive lava zone.jpg|A river of lava flowing near the Lava Castle ILZ Lava Flows.png|The rivers of lava from different angle ILZ to ALZ entrance.png|Lava falls in the Inactive Lava Zone Chamber LavaCastle2.jpg|The Lava Castle Screen Shot 2017-03-03 at 13.13.20.png|A Sea Dragon Leviathan in the Inactive Lava Zone ILZ Lava Falls View 01.png|Looking down into the Lava Falls ILZ Lava Falls View 02.png|Lava Falls ILZ Lava Falls View 03.png|Another view of the Lava Falls ILZ Lava Falls ALZ Entrance.png|An entrance to the Active Lava Zone in the Lava Falls ILZ_Pit_Overview.png|The Lava Pit ILZ_Pit_View_1.png|A view of the inside of the Lava Pit ILZ_Pit_View_2.png|Another view of the Lava Pit ILZ_Pit_Lava_Bubble.png|A giant Lava Dome inside the Lava Pit ALZEntrance2.jpg|An entrance to the Lava Lakes in the Lava Pit <gallery>


  • There was once a corridor leading to the Inactive Lava Zone that was found in the Crash Zone.
  • The Inactive Lava Zone is the hottest and deepest biome to naturally support Flora.
  • Some of the resources in this biome that are commonly found inside harvesting nodes (such as Titanium, Copper Ore, Gold, Silver Ore and Lead in the Lava Pit) can be found without being inside an outcrop.

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