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A 46-foot tunnel boring machine grinding 110 feet under a Virginia harbor chewed a mastodon loose from the seabed and pumped it toward land as slurry, and an operator watching the mud for metal spotte
Tunnel boring machines aren't picky eaters. Whatever sits in front of the cutterhead gets chewed up, blended with water and clay into a slurry, and pumped
Tunnel boring machines aren’t picky eaters. Whatever sits in front of the cutterhead gets chewed up, blended with water and clay into a slurry, and pumped back to daylight through a steel pipe, and nobody looks twice at that mud unless something in i... [6092 chars]
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