Cave has grown to 200 meters (Swiss Press Text 2013, by Portmann Sandro) - Swiss Press Award

Zentralschweiz am Sonntag

Portmann Sandro

The Hölloch cave system in the Muotathal valley is one of the world's largest cave systems. No one can say exactly how large it is, as surveys are still ongoing. Currently, the Hölloch measures just over 200 kilometers. Two cave explorers talk about their work and their fears.