Draining Chicago: What Lies Beneath

National Geographic Channel HD

3:00 PM to 4:00 PM

Friday 21 February

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Draining Lake Michigan uncovers Chicago's secret history. Sonar technology exposes a catastrophe that killed 300 people, solves a tragic Christmas mystery, uncovers a game-changing naval training programme from World War II, and reveals an engineering marvel that stops the fastest-growing city in the world from choking to death