Tunneling Machines Emerge From Central Subway
Friday, July 11, 2014
Photographer Karl Nielsen went underground for a final peek at Big Alma and Mom Chung, the tunnel boring machines named in honor of iconic figures from San Francisco. The massive machines have completed their nearly year-long journeys carving out tunnels underneath a notoriously congested corridor in the city. The tunnels will carry the extension of the Muni Metro T Third Line from SOMA to Union Square and Chinatown when the Central Subway goes live in 2019, making travel much smoother and swifter between some of the city's most vibrant neighborhoods.