LANSING — Public comment for the state’s environmental review of the Line 5 tunnel project ends on Friday, Aug. 29 — and one Michigan expert is raising concerns about the safety of the effort.

Brian O’Mara, a geological engineer with decades in the tunneling industry, says he’s concerned with some of the data he’s seen regarding the rock quality of the Great Lakes bottom lands.

The results are found in a 2020 study from WSP, an engineering consulting company who was contracted by Enbridge.

O’Mara says that over a quarter of those samples fell into the “very poor” category, closer to gravel than to stable rock.

“You could either have a disaster while they’re constructing the tunnel because of a sinkhole that develops under the existing pipeline, or you can have a fire and explosion th

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