CNN —A massive cargo ship plowed into Baltimore’s Francis Scott Key Bridge early Tuesday, causing the 1.6-mile bridge to crumble like a pile of toothpicks and plunge cars and people into the frigid water below. Here’s what we know about the catastrophe:Why did the bridge collapse? The Patapsco River is about 50 feet deep under the Francis Scott Key Bridge, Wiedefeld said. The water temperature in Baltimore Harbor near the site of the bridge collapse was about 46 to 48 degrees Fahrenheit on Tuesday morning. The Francis Scott Key Bridge lies in shambles after a massive cargo ship crashed into one of its pillars overnight in Baltimore.

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