Tunnel Boring Machine Through Mountain
You can complete a mile-long tunnel in no time with a tunnel boring machine!

Learn more				Tunnel Score: 100

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.

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