Mineralized Lava Tubes

Drying the climate on … uncovered a vast network of lava tubes throughout the planet's newly-exposed ocean floor. The magma flows which created these deep tunnels are dormant now, leaving behind a rich seam of minerals forged long ago in the extreme heat and pressure of …'s molten core. These pyroduct deposits are extremely dense; extraction operations here will be costly but highly lucrative.

The command below will trigger the "Mineralized Lava Tubes" event in Stellaris:

When this event fires, you can choose between the following option:

• Excellent.
  • Add deposit: Lava Tubes