Second Avenue Subway
After some years of stagnancy, New York's administration launched several projects for upgrading the city's metro system. On the one hand, the Line 7 was extended to the banks of the Hudson River and under 11th Avenue going south (2 x Herrenknecht Double Shield TBM). On the other, the long-awaited "Second Avenue Subway" was built on the eastern coast of Manhattan.
The S-434 Gripper TBM bored its way underground for the tunnel from 96th to 63rd Street. The hard-rock machine tunneled two 2.4 and 1.5-kilometer sections going southwards. Short sections of an open construction form were found between them. The TBM starteded tunnelling in June 2010 and reached the target shaft as early as September 22, 2011.
