Christopher, I'll have you know even Vermontahs knew about this tunnel collapse. Vermont's State Tunnel Authority is currently in permanent snooze mode. The only tunnel I know of in the state, that vehicles of any sort travel through, is the one under a hotel building in beautiful downtown Bellows Falls. As far as I know there haven't been any problems with it in the last century or so. Ruth At 11:16 AM -0400 7/12/06, [log in to unmask] wrote: In a message dated 7/12/2006 10:54:46 AM Eastern Standard Time, [log in to unmask] writes: 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, Jim, where you been, stranger - Vermont or something??? The Big Dig, the Ten-Year-Tunnel, the Boston Blow-Out - it's the project that ate downtown Boston, and then spit it out. (Indeed, it has improved north-south traffic fabulously, except the late unpleasantness.) Photo in Times today shows panels suspended by 10? foot high hangers from the actual roof of the tunnel. Not that many of them, as far as my comfort level goes - reminds me of the four pin design of the Mianus River Bridge on I-95 - but I am sure it was designed by One Of Ralph's Licensed Colleagues. Why do they need concrete to separate the traffic tunnel from the air chamber? Surely there is some cheaper solution, also lighter. Ruth, how does the Vermont State Tunnel Authority do this? Christopher -- To terminate puerile preservation prattling among pals and the uncoffee-ed, or to change your settings, go to: http://listserv.icors.org/archives/bullamanka-pinheads.html -- Ruth Barton [log in to unmask] Dummerston, VT -- To terminate puerile preservation prattling among pals and the uncoffee-ed, or to change your settings, go to: <http://listserv.icors.org/archives/bullamanka-pinheads.html>