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Giant holes are popping up all over the frigid tundra of northern Russia, and no one is quite certain where they come from. Reindeer herders spotted one of the first huge holes in 2013, in the region's Taimyr Peninsula. It was about 13 feet wide, nearly 330 feet deep, and - as they stumbled across their find - the men "were almost swallowed up by the crater. The herders never saw what made the hole, which has since grown to a whopping 230 feet wide and filled with water. [Source: Business Insider]
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