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 and Chujado. The proposed 73 km tunnel is projected to take 11 years to complete at an estimated cost of 14.6 trillion South Korean won (11.2 billion US Dollars).