Mystery of the Siberian holes at the end of the world 'solved': Scientists offer explanation
Three mysterious giant craters that appeared suddenly in northern Siberia could actually be a previously unseen type of sinkhole, experts have said. Explanations for the three enormous cavities, one of which was up to 300ft (70 metres) deep, have included everything from meteorites to aliens with some conspiracy theorists suggesting they could be connected to fracking.
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