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China: High-speed Ziyan Special Tunnel successfully achieves dual break through
Zi Muyan Special Tunnel started at the junction of Chongqing and Guizhou. 7,407 meters long.
cover tunnel photo by: Matt Brown from London, England / CC BY
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武道高速子母岩特長隧道順利實現雙幅貫通-新華網
big5.news.cn武道高速子母岩特長隧道順利實現雙幅貫通-9月19日，由貴州交建集團所屬路橋集團承建的武隆至道真高速公路子母岩特長隧道順利實現雙幅貫通。