page_title: Hải Vân Tunnel
section_title: Construction
hierarchical_section_title: Hải Vân Tunnel / Construction
caption_attribution_description: A view of the north end of the Hai Van Tunnel, facing south. To the left is a second maintenance tunnel that can also be used for emergency evacuations.
context_page_description: The Hải Vân Tunnel, the longest tunnel in Southeast Asia at 6.28 km, lies on Highway 1 between the two cities of Da Nang and Huế in central Vietnam.
context_section_description: The tunnel was split into two segments, a southern and a northern section. The southern section (4 km (2.49 mi)) was constructed by a Vietnam–Japan joint venture between the Japanese Hazama Corporation and their Vietnamese partners, Cienco 6. The 2 km (1.24 mi) northern section was constructed by a joint venture between Korea's Dong Ah construction company and Vietnam's Song Da Construction Corporation.
  The tunnel officially opened on June 5, 2005.
  The main tunnel is 11.9 m (39.0 ft) wide.  A second tunnel running alongside the main tunnel is currently used for maintenance and emergencies but it is planned to expand this at a later date as traffic increases.  It is connected to the main tunnel by 15 cross-tunnels.  The tunnels have lighting, fire alarms, communication, water supply and treatment, ventilation fans, and radio broadcast systems.
  The tunnel subsequently has received an award for quality by the American Construction Management Association.
caption: The north end of the Hải Vân Tunnel. The second maintenance tunnel is at left.
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