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The Jeju Undersea Tunnel (제주해저터널) is a proposed undersea tunnel project to connect the South Korean provinces of South Jeolla and Jeju across the Jeju Strait, with intermediate stops at the islands of Bogildo and Chujado.[1] The proposed 73 km[2] tunnel is projected to take 11 years to complete [3] at an estimated cost of 14.6 trillion South Korean won (11.2 billion US Dollars).