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Hello Imagine a mega project that takes you 600 meters underground, right in the heart of a giant mountain. Here, in the small Japanese town of Hida, people decided to dig the world's largest man-made cave. This required millions of dollars, years of work by engineers, and the efforts of hundreds of scientists from all over the world. So what led them to undertake such a monumental task? And why is this huge reservoir hidden deep underground? To learn the answers to these questions, listen to the details of this incredible project that promises to change the way we think about the universe. #pandora_tr