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I have worked on the construction of numerous tunnels, I did not hear about this incident you are referring to, I presume it occurred in a traffic tunnel, without an adjoining service tunnel, which would take care of the air issues. If it was one of the tunnels in the NYC area I would suspect hanger failure, what with the pollution. Reminds me of the hanger failure problem, with the stone face of the San Jacinto monument project here in Houston. Several of the limestone panels facing the concrete structure had broken loose, one going through the second floor museum library skylight, lodging in a table in the room. The monument is currently located around, and to the east of all of the refineries in Pasadena. The old galvanized clips started to fail, all of which were supplemented with three stainless steel pins per panel. I have to thank Ken for the information I gleamed while touring the monument with him several years back. If you get a chance ask him about standing on top of the monument. BTW, you have 4 ton ceiling tiles in your kitchen?

In a message dated 7/11/2006 10:06:39 P.M. Eastern Standard Time, [log in to unmask] writes:

Anything wrong with just letting the "natural" ceiling do its thing, without benefit of giant, four-ton, car-flattening, human-squashing-till-the-blood-and-brains-run-out concrete panels? Or would the human spirit be crushed without such aesthetic additions?

Sincerely, Reflected Plan

They may have used the space above the (formerly) hanging ceiling and the underside of the tunnel as a plenum for supply or exhaust air, for running wiring and pipes, or who knows what. The hung ceiling also would have covered up whatever sloppy workmanship existed in the underside of the concrete tunnel.

Just like the 2x4 lay-in tiles in every office building in the world. And my kitchen.