In this case it was part of one attempt at the Second Avenue subway. I think it was built in the 70s, then the city ran out of money and construction was halted

In this case it was part of one attempt at the Second Avenue subway. I think it was built in the 70s, then the city ran out of money and construction was halted. I believe the new Second Ave subway will not be using the same route in this part of Manhattan (or will be at a different depth) so they will not be using these tunnels/stations.