In 1980, Lake Peigneu, Louisiana disappeared into an underground vortex of doom. Actually, the accident was due to a math error, which resulted in one of the strangest oil drilling and salt mining accidents in U.S. history.
The Diamond Salt company had a huge salt mining operation under the lake. Meanwhile, Texaco Oil was drilling for oil from shallow platforms, which were built on the lake. Texaco roughnecks set a new drill a few hundred feet down, through the lake, through the lake bed, and into the earth. The drill bit hit one of the salt mine shafts, and the above disaster happened.
Just when you think it couldn’t possibly get worse, it does. The entire lake was sucked into the mine. The drill hole was originally 14 inches, but the force of the water expanded it to hundreds of feet across. At one point, a reverse water fall of 150 feet was formed because the Gulf of Mexico drained backwards (north!) into the lake. Watch the event unfold disaster on top of disaster. It is incredible. Via BoingBoing.