Explore the huge sewer system in Tokyo
Flood drainage system in the heart of Tokyo, Japan is the largest underground sewer in the world, with huge vertical wells and more than 70 large capacity pumps.'Endoscopy' with underground plastic equipment
This useful device is from Nguyen Anh Quang and Tran Thi Minh Chau (Nguyen Hue High School, Hue City, Thua Thien-Hue).