This was over the high-bay systems integration floor at a government contractor. The Air Force was on the floor (majors and whatnot) for a design review of their system (drone control system) when it blew.
40 Years of rafter dust, shrapnel, condensed moisture, and crap showered down as a God-knows-how-big scroll compressor tank in the back building purged itself.
The Air Force was not impressed. I was about 60 feet away and it scared the shit out of me.
The next week they were installing hundreds of feet of copper pipe. That was about 30 years ago, and when we vacated the building last year the copper was still going strong.