TOWER, Minn. (AP) — With an underground fire contained, a three-person crew has entered the Soudan Mine and turned on underground water pumps.

Workers have been battling a fire in Soudan Underground Mine State Park since it started Thursday. Minnesota Interagency Fire Center spokesman Carson Berglund says the fire was greatly subdued Sunday, but not completely out.

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Workers entered the mine Sunday, restored electricity and turned on pumps that work to remove water that seeps into the mine from the ground above.

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Minnesota Department of Natural Resources spokesman Mark Wurdeman says workers also determined there was likely no water damage to the $100 million University of Minnesota research lab in the mine. Workers determined the fire burned mostly wood material cast off over the years. The fire’s cause is unknown.

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