Echinger Weiher is a small lake near Munich. It was created when the Autobahn was constructed and is filled with water from some springs. The water is relatively clear (for german lake standards) and has about 12 degrees all year round.

Diving there is allowed when you pay a fee in advance (currently 8 Euro). There are some platforms for diving education, but it also has a nice underwater landscape and you can see some fish.