It is both – famous and notorious. One of the deepest man made lake in the southwest of Germany. Very often it is offering very good visibility which makes it a well known diving site not only in this region. And especially technical divers like it: Matschelsee. Unfortunately this lake is highly frequented by scuba divers – und thus is is very useful that you have to sign in from the following web site to get a permission to do so: Tauchclub Offenburg.
In this first video we are just at the head: