Fischbalmen is a steep wall dive on Lake Thun with shore entry via stairs and a deep drop-off that makes it one of the area’s best-known sites. The wall is partly overhanging, so the dive feels more like a controlled vertical profile than a flat lake traverse. Eels, pike, bullheads, and burbot are the usual wildlife draw, with clear alpine water helping the structure stand out. It suits experienced divers who want a cold-water wall dive rather than a leisurely lake swim.