One of the most important water tunnels in the world, the 85-mile Delaware Aqueduct is leaking up to 36 million gallons of water a day. Leaks were first noticed in the tunnel in 1991, but it has taken 10 years of analysis and preparation to plan for repairs. Options for repairing the tunnel include building a submersible device that could repair the cracks, drilling down from the surface and injecting grout from the outside or building a new tunnel. The initiative requires deep sea divers and a specially designed submarine to survey the damage.
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