I had no interest in going underground, but I sucked it up and humored our guest. Luckily, it turned out we weren't going to be lowered into a shaft from above. Instead, they took us down a track along a very large hill, and we entered an old shaft through the side.
It was 41 degrees inside the mine, so they gave us jackets to stay warm (and hardhats to stay safe).
As they pulled us through the cave-like entrance, one of the first things we saw was a classroom carved into the mine. For a while, Michigan Tech students had classes here.
At one point the tour guide turned out the lights.
We walked inside an old mining house.