An article about the Japan-Korea Tunnel was published in the South Korean magazine "Dong-A Weekly" on October 20, 2021.
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In September 2011, the leaders of Japan, China and South Korea established the Trilateral Cooperation Secretariat (TCS) to strengthen peace and common prosperity in East Asia.
~Omitted~
A representative project currently being conceived by TCS is the Northeast Asia Ring Railway & Expressway Initiative, which would connect South Korea, Japan, and China via an undersea tunnel across the Strait of Korea (Tsushima Strait) and the Yellow Sea.
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The full article can be read below:
Undersea tunnel to Tokyo and Beijing "Northeast Asia Circular High-Speed Railway and Road" Initiative