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Tunnel Boring Machines. These massive machines are essentially moving factories that cut through the rock, excavate the waste out of the back, and install the concrete shielding, all while pushing itself along like an inchworm.

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This object, found by construction workers, is of unknown origin and found in soil dating to around 7000 BC....or its the end of a nuclear waste depository. Which is more interesting?

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Manufacture of 10m diameter, 226t cutterhead part of Veligonda tunnel boring machine

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China Best Price large size turntable slewing bearing with premium quality

Exploring a Parasitic Tunnel Boring Machine— Parasitic worm genome and biology provides a solid basis for the development of new interventions

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THE GALLERY | Tunnel boring machine cutter lifted to surface for repair | Online news | New Civil Engineer