The Lake Peigneur accident is an example of this happening very, very quickly. It's quite a thing to see: https://youtu.be/3cXnxGIDhOA https://youtu.be/3cXnxGID

The Lake Peigneur accident is an example of this happening very, very quickly. It's quite a thing to see: https://youtu.be/3cXnxGIDhOA https://youtu.be/3cXnxGIDhOA From Wikipedia: > On Thursday, November 20, 1980, an oil rig contracted by Texaco accidentally drilled into the Diamond Crystal Salt Company salt mine under the lake. [....] The resultant whirlpool sucked in the drilling platform, eleven barges, many trees and 65 acres (26 ha) of the surrounding terrain. > The backwards flow of the normally outflowing Delcambre Canal temporarily created the biggest waterfall in Louisiana.