Cavico announced this week that it broke through to adit sub-tunnel number two, and so completed excavation of a 138ft (42m) high surge shaft for the USD 50M Song Giang 2 Hydropower project.

Cavico had excavated 4367 feet (1331.1m) of 8ft (2.44m) tunnels for the project as T&TI went to press. The Vietnamese engineering, design and construction firm was awarded the contract to excavate the surge shaft, two sub-tunnels and headrace tunnel in January 2009. Excavation distance totalled 2.8 miles (4.51km).

“This breakthrough represents months of dedicated work on the Song Giang 2 project and is a very important milestone for Cavico,” said Hung Manh Tran, executive vice president of Cavico.

“This marks Cavico’s fifth tunnel breakthrough in the past three months, and we are excited by the strong progress our teams are making at Song Giang 2.”

Located on the Song Giang River near Nha Trang City, Khanh Hoa Province, Vietnam, the plant will provide 141MKWh annually to address the electricity shortage in the country.