Like bowler Hanada, Kinichi Sato, a famous tunnel man at the Seikan Tunnel, also came to Kyushu.
I heard that he was passionate about the idea that now that 53km of the world's longest undersea tunnel, the Seikan Tunnel, had been dug, the only remaining project was a 235km Japan-Korea undersea tunnel.
Mr. Satkin (Kinichi Sato), who was a master of the side dump loader at the Seikan Tunnel, was able to carry it on his back to Karatsu. Heavy equipment was transported by ship from the Tsugaru Strait to the Tsushima Strait).
Based on geological surveys conducted over a five-year period starting in 1982, a comparison route for tunnels between Japan and South Korea was drawn, and a diagonal shaft base (approximately 200,000 square meters) was completed in Karatsu, Saga Prefecture.
The entrance to the sloping shaft has been opened, the pier, rails, and winches have been installed, and it's finally Mr. Satkin's turn.
He was able to dig a total of 400m of inclined shafts without any accidents, including 200m for the first phase and 200m for the second phase. (Currently, the third phase of construction has completed 150m and the length of the diagonal shaft is approximately 550m. The target length of the diagonal shaft is 1200m.)
In addition, the biggest challenge in the above-mentioned topographical and geological survey is the geological survey of the deep subseafloor, including the unconsolidated sedimentary layer that extends over 500m below the seafloor in the Tsushima Strait. conducted 16,000 km of sonic surveys (single and multichannel).
The person who provided behind-the-scenes guidance in this matter was Mr. Yuzo Takeuchi, who served as the manager of the Strait Line section between Ao-Kan and Kyushu-Shikoku. Mr. Takeuchi was the deputy director of Ryuhi at the time of the Seikan Tunnel flood accident.
We are also indebted to Engineer Takeishi of Hakodate for his full assistance in the design and modification of the research vessel (150-ton Teian Maru).
Because of his connection to sonic exploration using research vessels, Mr. Takeuchi now works as a matchmaker for Engineer Takeishi's eldest son.
In addition, for surveying and architecture, we were indebted to Hokkaido surveyors Shintani and Kawase Architects.
Particularly impressive was the voyage survey of the Iki Channel (30km of sea area from the Karatsu area of Saga Prefecture to the Iki area of Nagasaki Prefecture), which was the second voyage survey in Japan using light waves after the Seikan Tunnel.
Everyone really helped out with their lunch boxes. I am passionately thinking that the next step after the Seikan Tunnel is the Japan-Korea Tunnel!