The Pittsburgh Limestone Corporation operated the quarry in Ganister that eventually became the Blue Hole. Every year, the quarrymen were treated to an outing. This photo, taken at some point prior to 1937, is from one of those outings.
I have not identified most people, but from left to right: Ed Guerin, Mike Wapner, two unknown men, Wasil Youchison, Mitro Karol, and then a whole bunch of unknown men.
This photo comes from my personal collection. Mike Conrad (originally Kundrat) stands on the left and my great-great uncle Wasil Youchison stands on the right. The photo dates to 1927 and was taken from what is today Wertz Road. Below is a photo I took in 2012 from very nearly the same spot to contrast how the area changed over 90+ years.