Why researchers are sinking 3-story towers in Lake Superior

Crews in Duluth are preparing to lower five three-story-tall towers of photosensors nearly 700 feet to the floor of Lake Superior, just over three miles offshore of Two Harbors, with help from the Woods Hole Oceanographic Institute research vessel Neil Armstrong. Researchers from the University of Minnesota Duluth, the U.S. Department of Energy, Brookhaven National Laboratory and other universities hope the sensors will detect faint blue light emitted when neutrinos fired from Fermilab near Chicago pass through the water.