Drilling of the pilot tunnel was already completed in October of last year, the westbound primary tunnel was completed earlier this month, and the eastbound primary tunnel will be completed in September.
導坑已於去年十月貫通，而繼本月主坑西行線貫通後，東行線也將於九月貫通，目前隧道整體進度已達百分之九十四・八。