Lake dive, divers car park next to the shore (7€).
Sometimes good visibility but often 3m only.
You can download the map online, lines are set from different points. Very good training for orientation with compass.
It goes slowly to 40 m, muddy ground, don’t touch it too much otherwise you will be in a filthy cloud.
There are a lot of objects, like truck cabins, boats, tubes and various object to explore also between 20m.
Surface water temp change with seasons but under 20m it’s always 4 to 8 deg.
In WE you can also fill with air.