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This season, Jamie and Adam try something they've never done before: an implosion caused by a vacuum. The tall tale goes that a freight train tank car was being steam cleaned when a rainstorm let loose. The engineers made the mistake of sealing the container full of hot steam and headed home. The rain cooled the tank car, the steam condensed and contracted, and the resulting pressure differential caused the massive steel car to crumple like a soda can. Is it possible? The MythBusters devote an entire episode and embark on the biggest logistical operation in their history to find out.