The massive underground facility, which has been used to store archives since the 1960s, remains a crucial but convoluted hub ...

Hundreds of federal workers process thousands of retirement applications every month, by hand in a converted former mine.

Emergency crews in northern California rescued a 16-year-old boy who took a tumble down a 50-foot-deep mine shaft while ...

A mine safety expert says many old mines in Western Pennsylvania have less than 50 feet of ground cover between the mine and ...

Billionaire tech mogul Elon Musk drew attention to a circa 1960 converted underground limestone mine in Pennsylvania his team ...

The rope the group was using broke when attempting to climb up the mine shaft. A 16-year-old teen was rescued from a 50-foot ...