The Deep Sleep

Thousands of years ago the planet's average temperature dropped precipitously, and most sunlight was blotted out by clouds. To cope with the suddenly freezing climate the population migrated underground, forced to burrow deeper and deeper chasing the retreating warmth of the planet's core. Unable to maintain their burrowing population, a cryo-torpor project was initiated. It would automatically awaken them once the instruments detected a stable surface climate again. The planet did finally warm up, but the process was extremely sudden, de-calibrating the hibernation pods and incinerating the sleepers. All that remains are millions of pods filled with charred bones, sitting in silent rows in the dark.

The command below will trigger the "The Deep Sleep" event in Stellaris:

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

• Unfortunate.