The Metropolitan Transportation Authority celebrated a major breakthrough Thursday in the expansion of the number 7 subway line.
With a thunderous rumble, a 1,000 ton boring machine broke through the wall under the Port Authority bus terminal at 8th Avenue and 41st Street as part of the city's plan to connect the far West Side.
Another giant drill completed the eastbound tunnel earlier this year.
The city is paying for the $2.1 billion extension, which the MTA will fund once it is operational.
"You go back to the 70s, we stopped making investments like this. And the question was well, can you afford to do it now? You can't afford not to do it," said Mayor Michael Bloomberg.
"In just a few years, we will be riding this subway, and every single time I get on that train I will remember this moment," said MTA Chairman & CEO Jay Walder.
The 7 train extension is scheduled to be completed in 2013.