Video footage shows a large vortex in a lake in the US, as water is drained away following flooding. The video was taken at Lake Texoma, on the border between Texas and Oklahoma. The vortex opened up after water was drained away from the lake, following severe flooding. The two and a half metre wide hole could easily swallow a small boat, although it is walled off with buoys to stop vessels approaching. Video footage courtesy of Edward Johnson, Tulsa District, US Army Corps of Engineers Subscribe to BBC N
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