The Delaware Aqueduct, one of the world’s longest water tunnels, may be developing potential serious leaks. One leak has already created a pond and a stream with a flow of a million gallons per day. New York city officials plan to use a robotic mini-submarine being developed by the Woods Hole Oceanographic Institution to inspect the interior of the 13 foot diameter tunnel. Previous repairs required four deep sea divers to spend almost a week at 700 feet pressure to fix a leaking valve. Ironically, if the tunnel is repaired, the wetlands created by leaks will be destroyed, causing a potential EPA violation

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