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 soil and other debris, excluding boulders, was being shifted out of the tunnel with the help of a conveyor belt. Dewatering process with multi-stage pumping system to keep the tunnel in a ...

The conveyor belt was broken when a portion of the tunnel's roof collapsed on February 22, trapping eight persons, including two engineers and two machine operators. The accident occurred 14 ...