http://www.penguinpoop.com/2012/video-crews-start-demolition-of-civic-arena-roof/
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Video of constuction crews dropping a portion of the Civic Arena’s roof. At about the 1 minute mark you can see the whole roof slide when the piece is collapsing. View Video
http://www.penguinpoop.com/2012/video-crews-start-demolition-of-civic-arena-roof/