Rokko Railroad Tunnel

The Rokko Railroad Tunnel in Japan faced significant challenges due to extraordinarily difficult water and rock conditions. To manage these issues, engineers employed extensive dewatering techniques. This involved driving approximately three-quarters of a mile of drainage drifts and five miles of drain holes within a quarter-mile section of the main tunnel. This approach was crucial for mitigating high water inflows and preventing long stoppages during construction. The city of Takarazuka, located on Mount Rokkō, is a hot-springs resort known for its opera company and other recreational facilities.12