A recent news report heralded , along with a Daily Mail report, that four giant crater were found at the bottom of Lake Neuchâtel, Switzerland, by accident. Researchers were searching for evidence of recent earthquake or tsunami deposits when they stumbled across these craters on the northwestern shore of the lake near the Jura Mountains. The biggest crater is 525 feet wide and nearly 100 feet deep. They are some of the largest and deepest pockmarks ever to be found in earth's lakes. It is theorized that they were caused by erupting groundwater. The Swiss Alps quake at a magnitude of up to 6 occaisionally, which is another possible theory.
The craters supposedly spill over, according to the researchers, at least 4 times every 12,000 years. The last eruption occured 1,600 years ago. The mud eruptions leave behind distinctive layers of sediment very similar to that of a volcano.
The so-called Crazy craters is churning with wet mud. The mix of water and sediment creates a deep crack which penetrates nearly 200 feet down onto the layer of bedrock beneath.
In order to find out their cause, the team conducted a series of tests of the water and sediment around and in the craters. The results they found came up with a possible solution: these craters are connected to the Jura Mountain karst system, a network of limestone caves and cracks, due to the fact that the limestone found in the karst system also coats the bottom of the lake. The scientists also theorize that the limestone is bubbling up through the craters.
Overall, in my personal opinion, this is an extremely important scientific discovery. This could mean that there are still many things about the world's most famous bodies of water that we have absolutely no idea about. This could also teach use more about tectonic plate movement in this region, and the possible forming of volcanoes.

Crazy craters