This Planet made two episodes about these Siberian craters because, if you like weird stories, there's a lot to like about these craters. MORE: http://www.thisplanet.tv/blog/the-end-of-the-world Such as HUGE COOL-LOOKING HOLES IN THE GROUND of mysterious origin. We went to Russia to learn more.

This Planet made two episodes about these Siberian craters because, if you like weird stories, there's a lot to like about these craters. * SCARY GREENHOUSE GAS. One sure thing is that there was methane in these holes before they opened up.

These craters appeared in Siberia in the hot summer of 2014. There was methane in these holes but were they caused by climate change? We went to Moscow to learn about these huge holes in the ground of mysterious origin, including a surprising point of view from one Russian scientist exploring the craters. See This Planet Chronicle's post, The End of the World, for more.