- uploaded: Aug 3, 2013
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Since the 1980s, a strange phenomenon has been witnessed by thousands of people in the Hessdalen Valley in Norway - UFOs. Strange lights, moving at incredible speed along the ground or high in the sky, have been photographed, videoed and tracked with radar. A permanent research project is even based on the site. But even after all this, no one actually knows what the Hessdalen lights are, or what causes them.