Lost Boroughs

Extensive excavation of the fossilized imprints within the giant subterranean arthropod remains on … have confirmed these are indeed the remnants of a city! Populated by hundreds of thousands of meter-tall, tool-using creatures, this city was constructed within the very bowels of the gigantic arthropod. It is unknown how these creatures found their way inside of this subterranean giant, but their pre-Bronze Age society seemed to flourish for thousands of years within its digestive tract. Further study is required if we wish for further insight into this society's history and downfall -- and perhaps glean more about the death of their host.

The command below will trigger the "Lost Boroughs" event in Stellaris:

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

• Astounding.