The Russian Academy of Sciences is researching mysterious crater in northern Russia. They say they've never seen anything like it. "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." They crater was first discovered by video taken from helicopter posted on a social network that went viral. While they were able to approach it on foot—slippery oil and water prevented them from getting close to it.