Down We Go

The investigation into …'s missing population has made a breakthrough. Large sealed shield doors leading to a deep tunnel network stand as proof that the entire species started to move underground at some point. Cross-examination with geological and meteorological data indicates that the entire planet was gripped by a sudden onset ice age, perhaps triggered by a shift in axial tilt, which likely triggered the migration. Excursions into the vast tunnel network are underway.

The command below will trigger the "Down We Go" event in Stellaris:

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

• Keep digging!