Transparent Walls of a Tunnel in a Lake in Madra

Visitors look at the fish through the transparent walls of a tunnel in a lake in Madra, 70 km southeast from Brno, South Moravia, Czech Republic. The tunnel, which is located at a depth of three meters, measuring eight meters in length from which one can observe sturgeon, carp, catfish, perch, tench, eell and trout.