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While the west Edmonton mall was being built we were contracted toi sling Air conditioning units onto the roof due to the size of the structure a Crane could not put them in place. WE did a quick recon on foot and looked at the garbage on roof everything was cleaned up and away we go.
First lift as we approach the roof location I notice out of the corner of my Eye as I was on the roof giving hand signals a very large section of roof was lifting and tossed over the side turns out it was the wood structure that tempoarily covered the huge skylight opening coverd with plastic it quickly turned into a large Kite. Over it went into about 10 parked cars. Neither the structure or most of the cars survived..