SFGTV2 August 24, 2013
Things corrode, they rust. They get to where you turn them on and nothing happens. But it is so totally used in every nook and cranny, that making any accommodation to shut it down, to do something to it, is very difficult. Narrator two Massive Underground tunnels, called simply tunnel 1 and tunnel 2, provide most of the citys water supply. They run hundreds of feet below manhattan, far deeper than the subways. Built at the beginning of the 20th century, they are concretelined and bored through solid rock. They could last centuries. But the mechanical equipment within them will not. Engineers ...