This is a really big hole, 260 ft across. One man thinks this was caused by a phenomenon called pingo, basically a block of ice that melted away leaving this hole. There are signs there was an explosion though so I don't think it just melted away. Scientists are on their way there to find out what caused this so hopefully we will know soon.A mysterious giant hole has appeared in northern Siberia, prompting wild speculation about meteors, UFOs, and underground cities.
Mysterious giant hole in Siberia likely caused by global warming, not UFOs or meteors
If this was caused by global warming I wonder if there will be more of them, it was suggested it could happen, or if they could add to the warming problem. This took place near a gas field so I'm thinking methane could be involved.