Thermal Activity

The Alien Thermal Plant sits high on the wall of the Inactive Lava Zone, around 1,200m down - descend from the Lost River into the great lava chamber and hug the perimeter until you find the structure (the local Sea Dragon is the reason to hug the perimeter). Entry wants an Orange Tablet - one is cached along the Lost River route if you've been thorough. Inside: ion cube technology, the blue tablet for Fourteen Thousand Leagues Under the Sea, and a lot of lore. Achievement pops as you explore in.

Kit: Prawn Suit with depth module and grapple, or a shielded Cyclops parked somewhere unburning. Heat is the terrain here; plan your hops.