How Japan Built an Underwater Tunnel – The $15 Billion Megaproject

🎥 **Discovery Video** 📌 **How Japan Built an Underwater Tunnel – The $15 Billion Megaproject** 📺 Channel: Monolith Discovery 📖 Beneath the freezing waters of Japan's Tsugaru Strait lies one of the most extraordinary engineering achievements ever created ... 🔗 Watch full video: https://www.youtube.com/watch?v=fQarZ3QcXP4 Stay connected with Tolee for daily video updates across NASA, Discovery, National Geographic, Science, Education, Documentary, History, Space, Animals, Technology, and Kids Education!