On December 19, 1907, a tremendous explosion shook the Youghiogheny River Valley, killing 239 men and boys at the Darr Mine in Van Meter, Westmoreland County. The tragedy remains the worst mining accident in Pennsylvania history. But as time passes, there are fewer people with direct connections to the tragedy, and some of the Darr history is in danger of being lost forever. This episode reports on a small, but passionate coalition of people dedicated to preserving Darr artifacts, and the legacy of the miners who died there.