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Cave explorers delve into uncharted territory

The Geltenbach Cave in the Bernese Oberland is one of few unexplored places left in Switzerland. For six years, amateur spelunkers have been exploring this inaccessible cave and have already surveyed more than three kilometres of passages. (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