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MEGA DISASTERS asks the what ifs no one ever wants to face. A masterful blend of actual footage, computer graphics and interviews with leading scientists and public safety experts explores the outer limits of what could happen if everything went wrong.

Watch the full History Channel Mega Disasters: Comet Catastrophe movie online at no cost in high-definition (HD) quality. No downloads needed—simply click to play and experience the excitement with English subtitles included for your convenience.