The Russian Academy of Sciences is researching mysterious crater in northern Russia.<br/> <br />They say they've never seen anything like it.<br/> <br />(SOUNDBITE) SENIOR RESEARCH FELLOW OF CENTER OF ARCTIC STUDIES, ANDREI PLEKHANOV, SAYING:<br/> <br />"I've never seen such craters in anywhere on Yamal, where I've been. And I've never heard my colleagues talk of anything similar."<br/> <br />They crater was first discovered by video taken from helicopter posted on a social network that went viral.<br/> <br />While they were able to approach it on foot -- slippery oil and water prevented them from getting close to it.<br/> <br />(SOUNDBITE) SENIOR RESEARCH FELLOW OF CENTER OF ARCTIC STUDIES, ANDREI PLEKHANOV, SAYING (WHILE HOLDING MEASURING TOOL):<br/> <br />"We use gas analyzing equipment to spot combustible gas. But for the time being nothing shows. And radiation background is normal, even better than in the city."<br/> <br />Just what caused the crater is still a mystery.
