It was November of 1980, and an oil rig on Lake Peigneur, Louisiana, was drilling test holes when suddenly it accidentally bored a hole into an active salt mine below the lake. Chaos ensued at a colossal scale. The chain of events that was to follow included a whirlpool so huge, it sucked 11 barges, a tugboat, and much of the shoreline including several houses and 150 year old trees into a gigantic sinkhole that reversed the flow of a nearby river, and changed the lake from freshwater to salt water... not because of the salt mine, but because it filled up with water from Vermilion Bay several miles away. It changed the local ecology radically. For a while, a huge waterfall existed at the spot until the mine filled up, and force of the water entering the mine caused huge geysers at the mine entrance hole miles away.