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From Pathfinder Adventures: Troubles in Grayce, which isn't enabled.

Unlucky Collapsing Tunnel

HAZARD 3
UNCOMMONENVIRONMENTALMAGICAL
Stealth +8 (trained)
Description At the unluckiest time, the shoddily supported tunnel wall collapses in on itself and floods the tunnel with dirt and stone.
Disable DC 18 Nature check to counteract the aura of unluck that pervades the tunnels for 1 minute, or DC 20 Survival to support the tunnel ceiling properly without triggering a collapse
AC 18; Fort +10, Ref +10
Hardness 10, HP 43 (BT 21); Immunities critical hits, precision
Collapse
Trigger A creature enters the tunnel
Effect The tunnel falls in, dealing 2d10 damage to each creature in the area (DC 20 basic Reflex save). Creatures in the area must spend at least 5 minutes digging themselves out to continue (DC 20 Survival halves this time).
Pathfinder Adventures: Troubles in GrayceORC