PLTW Portfolio D Washington

                      Tunnels

Tunnel of Eupalinos

 The Eupalinian aqueduct on the island of Samos. Built in 520 BC by the ancient Greek engineer Eupalinos of Megara. Eupalinos organised the work so that the tunnel was begun from both sides of mount Kastro.
             Box Tunnel
Located in England, opened in 1841, was the longest railway tunnel in the world at the time of construction. It was dug and has a length of 2.9 km
    Chicago Deep Tunnel

A network of 175 km ; of tunnels designed to reduce flooding in the Chicago area. Started in the mid 1970s, the project should be completed in 2019.