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Report: Tunnel, trench offer options for replacing pipeline

Nuts, bolts and fittings are ready to be added earlier this month to the east leg of a pipeline near St. Ignace, Mich., as Enbridge prepares to test the east and west sides of the Line 5 pipeline running under the Straits of Mackinac. A report released on Friday concluded the 65-year-old pipeline could be replaced with pipes buried in a tunnel or partially enclosed in trenches. (Dale G Young/Detroit News via AP)

A 65-year-old pipeline carrying crude oil beneath a delicate waterway connecting two of the Great Lakes could be replaced with pipes buried in a tunnel or partially enclosed in trenches that would pose virtually no leak risks but would require years and hundreds of millions of dollars to build, according to a report released on Friday.

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