The tunnel is 11,000m long, of which 4000m were excavated using the drill and blast method of the New Austrian Tunnelling Method (NATM) and 7000m were constructed using a tunnel boring machine (TBM).
The Dai Ninh project is being constructed through a loan from the Japan Bank for International Cooperation (JBIC) and by Japan's joint venture main contractors, KAJIMA-KUMAGAI. Cavico is working as a subcontractor on the project and is responsible for the headrace tunnel and surge tank construction.
Cavico has completed final breakthrough on the headrace tunnel
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