They call it the Big Apple - the largest metropolis in America. Eight million people live in a city that never sleeps. Yet life here would slow to a crawl without one vital piece of infrastructure: the most extensive subway system on earth. Like the city, the subway never sleeps. Every week day, trains carry 4.5 million people – nearly the entire population of Norway - making it one of the world’s busiest subway systems. Yet daily, it faces a triple threat: from man, nature, and time. The threats range from breakdowns to flooding to terrorism. Within this vital organ, life pulses at the speed of a New York minute. And every day, the city struggles to keep it beating – and keep it safe. Megacities : New York - National Geographic
They call it the Big Apple - the largest metropolis in America. Eight million people live in a city that never sleeps. Yet life here would slow to a crawl without one vital piece of infrastructure: the most extensive subway system on earth. Like the city, the subway never sleeps. Every week day, trains carry 4.5 million people – nearly the entire population of Norway - making it one of the world’s busiest subway systems. Yet daily, it faces a triple threat: from man, nature, and time. The threats range from breakdowns to flooding to terrorism. Within this vital organ, life pulses at the speed of a New York minute. And every day, the city struggles to keep it beating – and keep it safe. 
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