Minister of Public Works and Public Housing (PUPR) Basuki Hadimuljono's project has 550 Meters long tunnel will have two tubes one leading to Jogja and one to Semarang. The depth is 50 meters from the surface.
Study still continue for whether tunnel construction worth the investment.
https://borobudurnews.com/unik-bakal-ada-terowongan-550-meter-di-tol-yogyakarta-bawen/
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://borobudurnews.com/unik-bakal-ada-terowongan-550-meter-di-tol-yogyakarta-bawen/
Unik, Bakal Ada Terowongan 550 Meter di Tol Yogyakarta-Bawen - BorobudurNews
borobudurnews.comBNews—YOGYAKARTA— Direktur Teknik Jasa Marga Jogja-Bawen, Oemi Vierta Moerdika memastikan dalam pembangunan tol Jogja-Bawen hanya ada satu terowongan.