Regarding tunnel excavation, the tunnel is 38m long. The tunnel was excavated by hydraulic rock drills. Dynamite was not used for tunnel works. There are many difficulties namely hard rocks, narrow tunnel and entrance erosion. The work was expected to be a challenge by both the investor and the bidder; however, it was completed.
As for the penstock fabrication, the 6-meter penstocks were proved to be of high quality when being scanned. There are many difficulties when installing the penstocks due to 50 degree and above slopes. The construction was on schedule with averagely 70 to 80 meters installed each month.
At the same time, Vimeco constructed the factory, TBA, Neoweb, Geosell, and reinforced 300m roof. The output is 37 billion dong.
Some photos of the ceremony:

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Translator: Minh Phương