Uploaded October 2025 | Updated September 2026, 3 weeks ago
Imagine a mega-project that takes you 600 meters underground — right into the heart of a massive mountain. Here, in the small Japanese town of Hida, people decided to carve out the largest man-made cavern in the world. It took millions of dollars, years of engineering work, and the combined efforts of hundreds of scientists from across the globe.
#pandora_us
Imagine a mega-project that takes you 600 meters underground — right into the heart of a massive mountain. Here, in the small Japanese town of Hida, people decided to carve out the largest man-made cavern in the world. It took millions of dollars, years of engineering work, and the combined efforts of hundreds of scientists from across the globe.
#pandora_us
