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出典:Wikipedia
出典:『Wikipedia』 (2011/06/26 19:28 UTC 版)
The Big Dig ceiling collapse occurred on July 10, 2006, when a concrete ceiling panel weighing 3 tons (2722 kg) and measuring 20 by 40 ft (6.1 by 12.2 m) fell in Boston's Fort Point Channel Tunnel. The panel fell on a car traveling on the two-lane ramp connecting northbound I-93 to eastbound I-90 in South Boston, killing a passenger and injuring the driver. The collapse caused a section of the tunnel to be closed for almost a full year.