An extinction level event was an event that might lead to extinction.

On Talos IV, nuclear war caused a near-extinction level event, but a small population of the indiginous species remained. (DIS: "If Memory Serves")

On Terralysium, an extinction level event was narrowly avoided in the late 2250s. A disruption in the gravitational stability of the planet's outermost ring sent radioactive particles on its way to the upper atmosphere, and eventually the planet's surface. Had this not been avoided, it would have caused nuclear winter. (DIS: "New Eden")

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