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Imagine a gigantic project that takes you six hundred meters underground, to the heart of a huge mountain. In the small Japanese town of Hida, people decided to dig the world's largest man-made cave. This project took millions of dollars, years of engineering and the efforts of hundreds of scientists from around the world. So what made them undertake such a monumental task? Why is this colossal reservoir hidden deep underground? Discover the answers to these questions today and learn more about this extraordinary project that has the potential to change our perception of the universe. #ItInteresting Anyone who wants to support our channel can become a sponsor! / @tointeresujace7074