The darkness of the depths is something all gamers will have to adjust to in Subnautica: Below Zero, especially if they want to collect some of the rarest resources. Many of the more desirable crafting components, like the much sought-after Gel Sack, can be found with far more frequency the deeper one dives.
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There are a ton of biomes, known as Underwater Caves, that are a bit trickier to find and are usually only accessible from Underwater Biomes, however, these nooks, crannies, and full-on caverns are definitely worth checking out for the undersea bounties they hold.
Murky and easy to get lost in, the Arctic Kelp Caves can be found via cave entrances near the seafloor of Arctic Kelp Forests. Within, players will find lots of Sea Monkey nests, useful fragments, and Kelp Root Pustules above all else. Thankfully, there are also Oxygen Plants, which can be a lifesaver if the player gets turned around and needs a few more seconds to regain their bearings in this maze of giant roots.
- Array Module
- Obelisk
- Water Analysis Station
- Alterra Misplaces 1km Capital Ship Aurora
- Kelp Root
- Oxygen Plant
- Radiant Sieve Coral
- Sulfur Plant
- Crashfish
- Hoopfish
- Sea Monkey
- Spinner Fish
- Laser Cutter Fragments
- Mobile Vehicle Bay Fragments
- Propulsion Cannon Fragment
- Seaglide Fragment
- Calaverite Outcrop
- Copper Ore
- Crashfish Egg
- Crystalline Sulfur
- Gold
- Ion Cube
- Limestone Outcrop
- Quartz
- Root Globule
- Salt Deposit
- Sea Monkey Egg
- Silver Ore
- Titanium
In the depths, there is great beauty to behold, but the Crystal Caves are not a place to linger and admire the natural radiance of its purple gem-like formations.
There are multiple Shadow Leviathan prowling these waters, which can make exploring the three sub-biomes of this area, the Main Crystal Caves, Crystal Castle, and Crystal Cave Fissure, far more dangerous than most places. However, there is definitely enough buried treasure to make this danger worth the trip, especially if one seeks to upgrade their Prawn Suit's arms.
- The Crystal Castle sub-biome
- None
- Blooming Raindrops
- Jade Membrane
- Reaper's Wineglass
- Ribbon Plant
- Bladderfish
- Feather Fish (Red)
- Rockgrub
- Rock Puncher
- Shadow Leviathan
- Triops
- Prawn Suit Propulsion Cannon Fragment
- Prawn Suit Torpedo Arm Fragment
- Argentite Outcrop
- Calaverite Outcrop
- Copper Ore
- Diamond
- Galena Outcrop
- Gold
- Kyanite
- Large Copper Deposits
- Large Quartz Deposits
- Large Silver Deposits
- Large Titanium Deposits
- Lead
- Limestone Outcrop
- Lithium
- Magnetite
- Nickel Ore
- Quartz
- Ribbon Plant
- Rock
- Ruby
- Silver Ore
- Titanium
- Uraninite Crystal
- None
- None
- Sulfur Plant
- Crashfish
- Triops
- None
- Crashfish Egg
- Crystalline Sulfur
- Diamond
- Kyanite
- None
- None
- Jade Membrane
- Polycage
- None
- None
- Calaverite Outcrop
- Gold
- Large Gold Deposits
- Large Kyanite Deposits
- Large Silver Deposits
- Magnetite
- Nickel Ore
- Rockpuncher Egg
- Titanium
Found by traveling down from the Lilypad Islands biome, this network of crevices is narrow and awkward to traverse in some places, though is well-lit enough for players to not get lost quite as easily as in other Underwater Caves. The glowing plants that illuminate the surroundings are also a target for traveling here, as these Grand Cotton Anemones produce eggs useful for advanced fabrication.
- Deep Lilypads Cave Cache
- None
- Deep Lily Pads Flower
- Grand Cotton Anemone
- Green Ternion
- Hanging Plant
- Lilypad
- Loop Plant
- Oxygen Plant
- Young Cotton Anemone
- Brown Spikey Trap
- Discus Fish
- Lily Paddler
- Spinefish
- Spinnerfish
- Squidshark
- Triops
- None
- Argentite Outcrop
- Calaverite Outcrop
- Flowering Spore
- Gold
- Large Gold Deposit
- Large Quartz Deposit
- Large Titanium Deposit
- Magnetite
- Nickel Ore
- Quartz
- Ruby
- Silver Ore
- Squidshark Egg
- Titanium
- Gold Trivalve Egg
- Uraninite Crystal
- Young Cotton Anemone
This continuation of the Purple Vents biome descents into caverns located deeper yet still possesses much of the same characteristics that make the shallower variant distinguishable: the eponymous hydrothermal vents that spout extremely hot purple matter. There is little in the way of plant life, though, the Deep Purple Vents biome is one that has the rare and valuable Gel Sack.
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- Fossil Excavator
- None
- Gel Sack
- Ragged Pitcher Plant
- Spiral Plant
- Feather Fish
- Feather Fish (Red)
- Seatruck Docking Module Fragments
- Crystalline Sulfur
- Ion Cube
- Lithium
- Salt Deposit
- Spiral Plant Clipping
- Uraninite Crystal
As one heads down deeper in the Twisty Bridges biome, this is where they will end up. The Deep Twisty Bridges are quite similar to their predecessor biome, however, everything here is exposed to less light, which gives this location an eerie feel; especially when one sees Squisharks lurking about.
Due to the sheer walls of this biome, it is recommended not to bring a Prawn Suit here, as it would be very difficult for the undersea vehicle to get out. It is worth noting that Gel Sacks can also be found in the Deep Twisty Bridges biome.
- Obelisk
- Seatruck Log #1
- Seatruck Log #2
- Blue Barnacles
- Broken Mandrake
- Gel Sack
- Oxygen Plant
- Blue Spikey Trap
- Spinefish
- Squidshark
- Triops
- Seatruck Fabricator Module Fragments
- Seatruck Storage Module Fragments
- Diamond
- Gold
- Ion Cube
- Lead
- Lithium
- Magnetite
- Titanium
Subtle in difference from the Twisty Bridges biome that this Underwater Cave can be found in, it is not to be confused with the Deep Twisty Bridges biome as it has notably different resources. The way to tell this biome apart from others of similar name and description is that the Twisty Bridges Caves are enclosed by stalactite-covered ceilings. There isn't much here, but it's still worth taking a peek if stumbled across.
- None
- None
- Blue Barnacles
- Oxygen Plant
- Arctic Ray
- Brute Shark
- None
- Argentite Outcrop
- Brute Shark Egg
- Calaverite Outcrop
- Copper Ore
- Crashfish Egg
- Crystalline Sulfur
- Gold
- Silver Ore
- Titanium
In contrast to most biomes found in the game, the Fabricator Caverns are loaded with vibrant red crystals. This biome can only be accessed by traversing through the Crystal Caves biome, as one might be able to glean from the similarly shaped crystal formations. Also like the Crystal Caves, there are Shadow Leviathan prowling here, so be on one's guard while exploring this location.
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- Fabricator Base
- None
- Eclipse Plant
- Ribbon Plant
- Bladderfish
- Feather Fish (Red)
- Rockgrub
- Shadow Leviathan
- Spinefish
- Triops
- None
- Argentite Outcrop
- Calaverite Outcrop
- Copper Ore
- Gold
- Kyanite
- Large Quartz Deposit
- Large Titanium Deposit
- Limestone Outcrop
- Nickel Ore
- Quartz
- Ribbon Plant
- Silver Ore
- Titanium
Located under a glacier in the West Arctic biome, the Glacial Connection is an Underwater Cave in the form of a tunnel leading to the Glacial Basin biome. Being trapped under the ice can be a terrifying concept, therefore many players feel more comfortable traversing this tunnel in a vehicle while looking for resources, despite the fact that the narrow path makes it tough, albeit possible, for watercraft like Seatrucks to pass through.
- None
- None
- Creepvine
- Hardy Cave Bush
- Radiant Sieve Coral
- Ribbon Plant
- Violet Beau
- Arctic Peeper
- Bladderfish
- Eye Jelly
- None
- Copper Ore
- Creepvine Sample
- Galena Outcrop
- Ion Cube
- Eye Jelly Egg
- Lead
- Limestone Outcrop
- Magnetite
- Ribbon Plant
- Silver Ore
- Titanium
Beneath Delta Island, there is this formerly Alterra Corporation-owned mining site designed to harvest large quantities of resources from the planet. When one makes their way here, they will likely find tons of Prawn Suits left behind after Alterra abandoned this location and all the goods here, which means it perfectly fine for the player to loot the Koppa Mining Site to their heart's content!
- Alien Statue
- Lava Geysers
- Aurora Wreckage Located, Survivors Confirmed
- Mining Site Delivery
- Was Unexplained Ion Signature Linked to the Aurora's Disappearance?
- Oxygen Plant
- Feather Fish (Red)
- Rockgrub
- Rock Puncher
- Triops
- Habitat Builder Fragment
- Laser Cutter Fragment
- Light Stick Fragment
- Prawn Suit Drill Arm Fragment
- Prawn Suit Fragment
- Thermal Plant Fragment
- Argentite Outcrop
- Copper Ore
- Diamond
- Gold
- Large Copper Ore Deposit
- Large Diamond Deposit
- Large Gold Deposit
- Large Ruby Deposit
- Large Silver Deposit
- Large Titanium Deposit
- Rock Puncher Egg
- Ruby
- Silver Ore
- Titanium
Like the Deep Lilypads Cave, the Lilypads Crevice biome can be found beneath the Lilypads Island biome. This network of nooks is within the seafloor and if one wants to find it, they'll have to keep their eyes peeled for the subtle crack-like entrances.
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There is a great variety of vegetation to be found in the Lilypads Crevice biome, including Gel Sacks, so be sure to explore this deep green den if one is looking for rare resources.
- Marine Life Analyzer
- None
- Antennae Plant
- Blooming Raindrops
- Gel Sack
- Green Ternion
- Hivemind
- Lilypad
- Oxygen Plant
- Paddle Fern
- Purple Cattail
- Radiant Sieve Coral
- Brown Spikey Trap
- Lily Paddler
- Sea Monkey
- Spinner Fish
- Prawn Suit Grappling Arm
- Prawn Suit Thermal Reactor
- Seatruck Afterburner Upgrade
- Seatruck Horsepower Upgrade
- Ultra-High Capacity Tank
- Calaverite Outcrop
- Copper Ore
- Gold
- Large Silver Deposit
- Lily Paddler Egg
- Limestone Outcrop
- Nickel Ore
- Ruby
- Titanium
Dark and obscured by hydrothermal vents spewing dank clouds, the Thermal Spires Caves are very hot and easy to get lost in, so be sure to bring a Flashlight. This biome can be entered from the Thermal Spires biome located higher up, near Delta Island. There isn't too much to be looted from this locale, however, this area can be used as an alternate route to the Koppa Mining Site.
- Mineral Distillery
- None
- Oxygen Plant
- None
- None
- Argentite Outcrop
- Cryptosuchus Egg
- Diamond
- Galena Outcrop
- Gold
- Lead
- Limestone Outcrop
- Silver Ore
- Titanium
NEXT: Subnautica: Below Zero - Everything You Need To Know About The Ice Worm Leviathan