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Underground labyrinth attracts scientists and tourists

The Hölloch system of caves in the Muotha Valley has fascinated researchers for 140 years. Since its discovery in 1875 the Hölloch has attracted armies of adventurers, scientists and tourists. (SRF/swissinfo.ch)

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SWI swissinfo.ch - a branch of Swiss Broadcasting Corporation SRG SSR

SWI swissinfo.ch - a branch of Swiss Broadcasting Corporation SRG SSR