Vintage work crew photos

[Toolmaker51]

Note the wire rope suspending pipe section. Judging by the men's heads, at least 4" diameter.
My very first exposure to industry happened at Hoover Dam, way down in the turbine room, also where I saw my first serious lathe. Probably Monarch, American Tool Works, or Lodge & Shipley.
I imagine it is still there and operative. A good case for preventative and regular maintenance; they sure won't get another one down there.