The region’s terrain made mechanised extraction difficult, leading to a proliferation of rat-hole mines. This hazardous method involves digging narrow tunnels that are barely large enough for a ...

Remember the Rat Hole? We do, too. Photo ... over-capacity celebration at RPM Events on the Chicago River, and it packed a lot in: open bar, a Daley interview and even protesters.

A team of "rat-hole miners" – experts trained to work in extremely narrow, often hand-dug tunnels resembling rat burrows – joined the rescue mission on Monday. It marked a significant move as ...