I think a good deal of the tunnel under the English channel has been dug with TBMs. But these last points were dug manually and there you go! Two sides meet each other under the sea!
Watch The World's Biggest Tunnel Boring Machines From The USA And China.
In this video, you'll see Giant Tunnel Boring Machines. These so-called tunnel boring machines are so great when it comes to digging the ground because, they are much safer to...