TOPSHOTS Visitors look at the fish throu...TOPSHOTS 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 on September 30, 2013. 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. AFP PHOTO/ RADEK MICARADEK MICA/AFP/Getty Images

Radek Micaradek/AFP/Getty

A three-metre deep underwater tunnel allows visitors to watch fish in a lake at Madra, Czech Republic. Sturgeon, carp, catfish, perch, tench, eel and trout can be viewed from the eight-metre transparent tube, located 70km southeast of Brno, South Moravia.