Dungeons are Real

From the introduction: [An] adventure for 4 characters of 1st experience level, pre-rolled characters are included. ... You awake after sudden collapse of the corridor behind you. Dust is settling in the flickering light of the flashlights. You hear the coughing of your friends. The room is 30 feet wide and of same length, there is lot of rubble on the floor. Dark corridor 10 feet wide opens in the northern wall. Air tastes funny, somewhat metallic like copper pennies in your mouth.