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

The federal government still processes retirement applications manually in a Pennsylvania limestone mine, a system Elon Musk ...

Elon Musk took aim at a limestone mine in Pennsylvania, where they said federal employee retirements are processed using an outdated system.

A truck fell into a massive sinkhole that opened up on a busy prefectural road on Jan. 28. As the truck driver is still trapped, rescue workers must put his safety above all else while striving to ...

Five households in the immediate vicinity of a massive, ever-widening sinkhole near Tokyo were urged to evacuate Sunday, with ...