What area requires 1700m deep in Subnautica?
That would be the Lost River! You'll need to explore deep to find it. Good luck and watch out for Ghost Leviathans!
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Definitely the Lava Lakes in the Lava Zone. Make sure your Prawn Suit is ready for some serious heat!
The area you're talking about sounds like the Lava Zone. Pro tip: pack lots of heat-resistant gear!
Pretty sure it's the Inactive Lava Zone. Dive deep and get ready for some intense exploration!
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