30 years on, world's longest undersea tunnel faces challenges

As the Seikan Tunnel, the world's longest undersea tunnel connecting two of Japan's main islands by railway, marked the 30th anniversary of its opening Tuesday, better coexistence between high-speed trains and freight is still under study.The 53.85-kilometer tunnel connecting the northern tip of Honshu with Hokkaido, of which a 23.30-km portion runs undersea, has been serving as a major transport artery ever since its opening as it is hardly affected by weather conditions, including heavy snow in winter.According to data by Hokkaido Railway Co., it took about 24 years and cost about 690 bil…READ FULL ARTICLE