An curved arrow pointing right. Giant holes are popping up in the tundra of northern Russia and residents as far away as 62miles have reported hearing explosions. Here's what researchers think is ...

As a surveillance drone from the Ukrainian 47th Mechanized Brigade watched, the Russian vehicle tipped into the hole. An explosive first-person-view drone immediately slammed into the stuck tank.

Episode 8. Chris uncovers the cause of some mysterious holes in the Russian tundra. We’re sorry, the information you’re looking for isn’t available right now ...