The mystery of the waterfall flowing in

Devil's Kettle Double Waterfall, in the state of Minnesota, USA, has a flow into Lake Superior; however, the destination of the other line is still a mystery of nature .

Devil's Kettle double waterfall has been a headache for geologists and adventurers for decades.

Along the north side of Lake Superior, the Brule River, located a few miles south of the US and Canada border, is divided in half by a rock rising in the middle. While a stream descends along two ledges and falls down to Lake Superior below like other waterfalls, the other flows into a deep pit, known as Devil's Kettle, and disappear right there. Up to now, this small waterfall has fallen into a difficult question.

Believing that there must be an end point for this flow somewhere underneath Lake Superior, many researchers and explorers poured dyes, table tennis, and logs into the Devil's pit. Kettle, and wait for the sign on the lake. However, up to now, all the things that were put into this deep hole were missing.

This phenomenon became even more mysterious and strange, as geologists went to check out the Devil's Kettle pit.

If in the film, below this deep pit is a large and long underground river, in fact, these types of underground and deep dynamics are extremely rare, and only formed in places where there are types soft rock like limestone. Meanwhile, geology in northern Minnesota is formed by much harder rocks.

For some hard rocks in the region such as Riolite and Bazan, in theory, their tectonic process sometimes impacts the bedrock, and creates an environment for permeable water. However, there is no evidence that this phenomenon has occurred in the geological layer of the region. And if there is such a phenomenon, the Devil's Kettle cannot be drained from the Brule River indefinitely.

There is another theory that millions of years ago, an empty lava tube formed in the lower surface of the basalt soil in the waterfall. Over time, the inflowing water eroded the surface of the Riolite rock, and flowed straight into this lava pit, creating a large opening on the bottom of Lake Superior. However, this hypothesis brings a lot of doubt. In fact, lava tubes are formed in basalt layers flowing along volcanoes; And if geology in Northern Minnesota can make an exception to that theory, there has never been a lava tube discovered in hundreds of basalt layers in the region.