New York City has two water tunnels connecting to the city’s water supply upstate. One was built in 1917 and the other was built in 1936. No one is certain of their condition. To ensure that New York City has a constant supply of water, a third water tunnel is being constructed. This massive project basically involves tunneling though sixty miles of rock deep underground. The project began in 1970 and it will not be finished until 2020 (unless the “Tea Party” stops it). Cost is estimated at six billion.