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| navigate by keyword : pipe tunnel soil excavation construction underground drilling round hollow perspective borehole cavity crosssection geology earth excavationwork tube cylindrical dirt trench inspection interior drillingrig pipeline bore excavationtool engineering subsurface infrastructure geologycore boreholeview tunnelvision subterrain subsurfaceview drilledcore soilprofile pipeinterior earthtunnel undergroundpath core sediment erosion passage soillayer shaft layer depth tunnelview |
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| A perspective from within a cylindrical bore reveals a subterranean passage cutting through layered earth, hinting at engineering progress beneath the surface |
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