On the 23rd of June, 2012, in the city of Elliot Lake in Ontario, Canada, a segment of the rooftop parking deck at the Algo Centre Mall collapsed, smashing down through two floors of the shopping center. The incident, which claimed the lives of two people and injured 22 more, lasted just a few short moments… but was the result of a slow, quiet, corrosive process that had been going on for decades.