Wait, I always thought the tunnel was bored through the bedrock under the river. You’re telling me the river is RIGHT THERE above the roof of the tunnel? I’ll be taking the Queensboro Bridge next time.

“Officials said the drill passed through 50 feet of water and then another 50 feet through soil before breaching the tunnel.” www.cbsnews.com/newyork/news...

Ok, there is a lot of bedrock between the river and the tunnel, this is just one long and powerful drill.

A lot of those tunnels (like particularly on the East River side) are in the riverbed but stabilized by very deep foundations.