When Emily Eckel moved to Knoxville, a neighborhood south of downtown Pittsburgh, she was told to buy special subsidence insurance, just in case the abandoned coal mine beneath her house ever caved in. She'd never heard of it.
“I just started imagining this vast maze of coal mines under the city," she said. "I was picturing coal miners going in with a pickaxe or a shovel and a yellow canary and a cage and mining all day. I don’t know if it was like that, and I would like to know.”
It was not exactly like that, at least not in Pittsburgh.