From the Bush, close to the aardvarks, is an underground tunnel of adventure, which leads to Burgers' Desert. The tunnel is made to look like a deserted mineshaft. There's a lot to be discovered for young and old adventurers, for example a gold-vein, fossils, minerals, crawling spaces and short-cuts and even a stalactite and stalagmite cavern. A few animals that like darkness, also live in special quarters in the tunnel. For example, in the cavern with the stalactites and stalagmites swims a school of blind cave fish. Because these fish lived in dark caves for many generations their eyes are no longer functional.