Macocha

The Macocha Abyss (Czech: propast Macocha), also known as the Macocha Gorge, is a sinkhole in the Moravian Karst cave system of the Czech Republic. The sinkhole is 138.5 metres (454 ft) deep, which makes it the deepest of its kind (light hole type) in Central Europe. It is a popular tourist attraction for casual visitors to the region, in addition to cavers and advanced technical divers.