In January 2009, the Korea Transport Institute also proposed a line from Mokpo to Jeju Island, putting Jeju 2 hours 26 minutes from Seoul. The line would include a bridge from Haenam to Bogil Island and a undersea tunnel from Bogil Island to Jeju Island (with a drilling station on Chuja Island), for an estimated cost of US$10 billion. As the proposal was popular with lawmakers from South Jeolla province, the government is conducting a feasibility study, but the governor of Jeju expressed skepticism. The route Seoul-Jeju has been mentioned as the world's busiest air route with 9.9 million passengers in 2011.