THE TUBE ALTERNATIVE
The TUBE would be similar to the I-90 tunnel. It would be bored through the earth under the city from the industrial end of South 6th Avenue. to the north end of the existing Battery Street Tunnel. It's a real tunnel, not the cut-and-cover approach proposed on the waterfront. The advantage to boring a tunnel as opposed to digging a trench is that life can go on as normal above, while the work goes on down below.
Tunnel boring projects are quite common throughout the world. (see