Excavation work has been completed on Korea's longest undersea tunnel.<br />The Boryeong Undersea Tunnel runs between Daecheon port in Boryeong, Chungchungnam-do Province and Wonsan-do Island.<br />The six-point-nine kilometer tunnel will be the 5th longest undersea tunnel in the world.<br />The project includes the undersea tunnel, which is expected to open by the end of 2021, and a bridge connecting two islands which is set to open later this year.<br />It will cut travel time between Boryeong and Taean from the current 90 minutes to just 10 minutes by car.<br />
