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Rescue workers leave the site as they continue attempts to secure the building before searching for any survivors at the site of the collapsed roof of the Algo Centre Mall in Elliot Lake, Ontario on Monday June 25, 2012.Chris Young/The Canadian Press

How do you rescue someone from inside a collapsed building? We've got someone who knows.

Sean Tracey, chair of the Canadian Centre for Emergency Preparedness, took your questions on emergency rescues. (Mobile users click here)