Dead Colony

… shows every sign of having been a thriving Irassian colony world up until approximately 1,200,000 years ago. Given their age, the ruins found so far on the …'s surface are in fairly good condition. There are no signs of orbital bombardment or armed conflict. The Irassian colonists appear to have succumbed to the Javorian Pox, after which the aggressive native flora reclaimed the lifeless cities and hid them under a dense layer of vegetation.

The command below will trigger the "Dead Colony" event in Stellaris:

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

• Curious.
  • Start special project: Colony Ruins