450-foot Machine Bores 4-Mile Tunnel In Earth, Discovers 4-Miles of Dirt

By John Newlin on
A miner emerges from a 450-foot-long tunnel-boring machine upon breaking through from under the San Bernardino Mountains after drilling a four-mile-long, 19-foot-diameter tunnel that will help improve the importation of water from Northern California for nearly 19 million Southern Californians on August 20, 2008 near San Bernardino, California. Metropolitan Water District of Southern California's Arrowhead West Tunnel is the last of three tunnels mined for the Inland Feeder, a high-capacity...Read Full Story