Public authorities had barred the entrance.
Judging from the splintered slats on the ground nobody cared.
Big surprise.
They entered the tunnel, switching on their headlamps.
The walls were roughly carved, the path leading down steep and slippery with scree.
"Damnit!" Dean swore, touching the spot where he'd grazed his scalp.
"How could anyone work here, apart from friggin dwarves?"
Sam winced in sympathy. "It was the gold rush. People left their homes and families to get a piece of the cake. They drilled the stone by hand, mostly in complete darkness. Must've been..."
A scream drowned his last word.