SAULT STE. MARIE, Mich. — The U.S. Army Corps of Engineers says it plans to salvage one of its tug boats that sank while being towed in the upper St. Marys River.

No one was aboard the Hammond Bay, which went down in the waterway between Michigan's Upper Peninsula and Canada. Army Corps spokeswoman Lynn Rose said that there's no visible damage to the Hammond Bay and that officials will investigate why it sank.

The boat is in about 37 feet of water, about 290 miles northwest of Detroit.

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