Certainly Gone Now

There is clear evidence that … was at some point inhabited by a sapient species. Ruins that have been found of an industrial age civilization on the cusp of pre-FTL spaceflight. At some point, however, this civilization was struck with a planet-wide calamity and totally extinguished. Little more than rubble remains, and there are no signs that any protective measures were taken by the afflicted population. The event was not violent or destructive, everything just seemed to... stop. Whatever hit them came as a complete surprise... or, perhaps, they chose not to resist it.

The command below will trigger the "Certainly Gone Now" event in Stellaris:

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

• Keep digging!