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Giovanni Badino is one of the world's top ice cavers. Ice cavers spend their time inside glaciers-enormous walls of ice that travel very slowly down mountains. One of Giovanni's adventures took place on the Gorner glacier in Switzerland, Europe's highest glacier. Giovanni led a team that explored hundreds of metres down inside the glacier. They frequently had to swim through freezing pools and rivers of melting ice. Inside the glacier, the ice is always moving, so the team also faced the danger of the caves and tunnels falling in and trapping them. Because of people like Giovanni Badino, we now know much more about what goes on inside glaciers.