That's the strangest looking thing:
It's to small to be a meterorite I would think. Aliens? It almost looks like it was drilled out.
Actually, it looks like it collapses from underneath, don't you think? Almost like there was a cavern under?
Yeah I see it now. one Scientist thinks it was caused by an underground explosion caused by global warming.
Siberia contains immense reserves of methane hydrates (also known as clathrate). If you've never heard about this you want to read up on it. Loosely speaking it's natural gas methane trapped in ice. If you get a chunk of that you can actually set it on fire -- burning ice.
If due to increase in temperature that ice melts and the gas is released, at a minimum you have pretty much you would expect happens when you get a ton of natural gas being suddenly released underground.
This is actually pretty scary stuff. Methane is a wicked bad green house gas something like 20 times as potent as carbon dioxide. And there are times and tons of these hydrates, read up on it, you won't believe how much there is out there, particularly in the oceans. The quantities are absolutely astounding. In fact there have been active research programs to mine hydrates as a source of natural gas. About 10 years ago when it look like we were running out of the stuff, there was very active research in this; Japan was heading toward tapping ocean reserves and there was a promising pilot program run in the Northwest Territories of Canada. That's kind of dried up when fracking became economically viable. But if you look at the reserve estimates they will blow your mind. The resource is there, it's just not economically viable to exploit it with current technology. Much like where we were with shale gas 20 years ago. Given how much cheap gas has come on the market lately, you probably won't see much work on exploiting the hydrates anytime soon. But the size of the resource is staggering.
Looking at it as a potential source of energy is one thing, looking at it for the potential of what could happen if something went wrong with it is entirely another. That's the scary shit. I can't number right now but I'm pretty sure that Michael Crichton wrote a book about what would happen in that case... I don't know if it was published or even if he finished it before he died.
This may well be an isolated event with this crater. Stuff happens. However if this is a sign of a start of widespread release of methane gases from the hydrates, we are all screwed. Aside from the disruptions of stuff like this crater happening all over the place and all over the ocean floor, you're talking Venus like global warming with all that much methane.