The Devil's Kettle Falls

The MOST interesting waterfall I have ever seen. The Devil's Kettle (lower left) is a waterfall that literally plunges into a hole in the rock and NEVER comes out. Geologists have done everything they could to find out where this water goes to but have been stumped thus far. There are two theories: one states that it comes out at the base of the falls or somewhat downstream, but dye testing disproved it (they put dye in caves like this sometimes to track exits and entrances to caves). No dye re-appeared downstream anywhere. The second theory states that it empties itself into the lake bottom of Lake Superior some 5 miles away through underwater caverns. No one knows yet... I hope to find out while I'm at U of M Duluth. I will have your secret Devil's Kettle!