CBS Minnesota: A $50 million physics laboratory operated by the University of Minnesota was threatened by a fire that started last Thursday in the Soudan Underground Mine State Park near Tower. The fire was believed to be burning between the 23rd and 25th levels of the mine. The Soudan Underground Laboratory is on the 27th level, near the very bottom. Also, because the power had been turned off, water, which would normally be pumped out, was draining into the bottom of the mine, potentially flooding the lab. As of yesterday, the fire was thought to be contained, and the lab appeared to be fine, but the source of the fire has yet to be determined.