In potosi. Headed down at 9am, and the guys were already smashed, so they insisted I started into the booze too. Im not claustrophobic or anything but being in a small dark mine shaft, knowing there's a kilometer of rock over your head is fairly unsettling tbh.
Then the nonchalance that these (completely battered) guys treat high explosives with is terrifying, they had me cutting up sticks of dynamite, preparing fuse cord and blasting caps, packing ammonium nitrate, then ramming the lot into holes in the mine face with a metal rod. My sphincter tightened on every blast, I was certain it was gonna cause a cave in.
Afterwards they took me to the most mental bar in the world; miners only, hidden in the back yard of a house, spent the evening hammering beers, arm wrestling miners and dancing with cholita's.