Here's what you should have before making the journey: RELATED: Subnautica: Below Zero - Where To Find Nickel Ore These provide light when it's dark, so you can make this journey during the night. This biome is pretty obvious once you're there - there are multiple vents on the floor that spew purple liquid. Go past the Thermal Spires biome and you'll reach the Purple Vents. To get there, you need to head South-South East through the Thermal Spires biome.Īlong the way, you'll see several Cryptosuchus - which can attack your Seatruck - and are best avoided by staying close to the seafloor. The Purple Vents biome is located around 700 meters from your Drop Pod location. The best place to find loads of Lithium is the Purple Vents biome. You can always set up a forward base close to the Purple Vents biome to make collecting Lithium a bit easier. Eventually, you will need a lot to complete all your building projects, even if you're not going for a megabase. This is why it's a good idea to start stockpiling Lithium.