VOICED : Sleeping bats lie in Polish war bunker

The video explores the use of WWII bunkers in western Poland as a hibernation site for thousands of bats, highlighting the stable temperature and high humidity that make it ideal for them. It also delves into the history of the Austwell fortification, built by Hitler to protect the Third Reich, which is now a museum. The site has become a tourist attraction, but visits are controlled to protect the bats, as disturbing them can be fatal.

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