Tunnel Boring Machine Through Mountain
Here's how the tunnel boring machine, or TBM, works:
As the 200-ton TBM moves forward, a round cutter head studded with titanium teeth grinds into the tunnel face and splits large chunks off the rock. The cutter head carves a smooth round hole through the rock -- the exact shape of a tunnel. Conveyor belts carry the rock shavings through the TBM and out the back of the machine to a dumpster.
The TBM is the fastest, most accurate way to carve a tunnel through rock today.