Strange Falls baffled scientists all over the years

Do not be surprised of the name is a waterfall baffled scientists over the years, this waterfall is located in the state of Minnesota in the garden Judge Magney State Park, and the stranger in this waterfall that is divided into two sections, a first section the eastern branch flows into the river called Brule, Second section the western emptying into in a groove of the rocks and we can see the water up to three meters away from the groove depth, but it is strange that after the water completely disappear and no one knows where to go, this has been renamed "Devil's Kettle Fall", the strangeness of this unique phenomenon and with the technological advances did not succeed scientists explain this phenomenon yet, even some scientists had dropped a ball with the water entering the groove in order to listen to the sound of water hitting the corners or know where settle into a groove, but they failed to reach for something. Scientists still do not know where all this water goes.