What If Disasters
GroundChecked 2026-10-25 · 1 source

Yellowstone Erupts

A single supervolcano rather than the every-volcano round: the surface turns toxic, a wall of ash moves across the map, and the heat arrives with it. Underground sealed space is the only cover that works.

The banner says“What if Yellowstone erupted?”
Hazard typeGround
Where it hitsAny map, outdoors
How to surviveGet into a sealed underground space — a bunker — before the eruption reaches the map. A normal building is not enough once the ash cloud arrives.

How the round plays out

  1. 1.The eruption starts and the air outside turns toxic — being outdoors becomes damage.
  2. 2.An ash cloud moves across the map, bringing heat with it.
  3. 3.The surface stays lethal for the rest of the round, so anything above ground is lost.

Where it kills you: The surface at any point after the eruption: streets, roofs and ordinary buildings. Players die by coming back up to look.

What to do in the 30-second head start

  • ›Find the bunker or underground space during the first stage, before the ash arrives.
  • ›Do not come back up to watch the cloud — the recorded death was on the stairs.
  • ›Treat the roof as gone for the whole round, not just for the blast.

If you are already caught out: Get underground and stay there. The round is decided by whether you had sealed space, not by how you move once the cloud is overhead.

Worst maps for it: Maps without underground space excepted — Jungle Pyramids has the most sheltered ground of the recorded maps.

Surviving is half preparation and half knowing the map — see the map list and the round guide for the 30-second head start.

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