. . "ceiling panel collapse" . . . . . "tunnel collapse" . . "Fort Point Channel Tunnel" . "one death" . . "Big Dig tunnel ceiling collapse" . . "Big Dig ceiling collapse" . . . "Big Dig ceiling collapse" . "fatal ceiling collapse in 2006" . "collapse of a portion of the roof of the I-90 Connector Tunnel" . . . . . . . "The ceiling panel collapse" . .