It's also 12 stories deep in the ground.[1] I was also looking for the other dimensions for the tunnel. It's just crazy to think about digging holes like that. Just like the Channel Tunnel along the English Channel. Insanity is just the name of the game when it comes to Tunneling.

[1] http://www.npr.org/2014/12/10/369777033/bertha-the-giant-bor...