Haivan Pass Tunnel
CONSTRUCTION
PROJECT
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Progress Report > Package IA - North Tunnel Section
Main Tunnel Full Face Excavation Breakthrough to Top heading MT ~ VA Side at Station 4+194.80
Khu vực thông giữa hầm chính và hầm thông gió tại Station 4+194.80
Tháng 05/2003 - Trở về
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