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The Jinping-II Dam hydroelectric power project involved excavating a number of large tunnels under the Jinping Mountains: four large 16.7 km (10.4 mi) headrace tunnels carrying water east, [8]: 30 two 17.5 km (10.9 mi) vehicular access tunnels, [9]: 1 and one water drainage tunnel.
About 30% of the power from the Jinping dams is used locally, and 70% will be sent to eastern China via ±800 kV bipolar HVDC transmission lines. [ 8 ] In addition to the four headrace tunnels, two roadway tunnels (A and B) were constructed with a diameter of 6 m (20 ft), and a drainage tunnel 7.2 m (24 ft) in diameter.
A report written by a Georgetown University team led by Phillip Karber conducted a three-year study mapping out China's complex tunnel system, which stretches 5,000 km (3,000 miles). The report determined that the size of the Chinese nuclear arsenal is understated and as many as 3,000 nuclear warheads may be stored in the tunnel network.
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Cross-Harbour Tunnel (underwater) (road) Eagle's Nest Tunnel (cross-mountain) (road) Eastern Harbour Crossing / Tseung Kwan O line (road and metro) Kai Tak Tunnel (beneath site of former Hong Kong International Airport) (road) Lion Rock Tunnel (cross-mountain) (road and water pipe) Sha Tin Heights Tunnel (cross-mountain) (road)
There are four classes of road tunnels in China by length. [1]Super-long tunnel (>3,000m) Long tunnel (1,000m-3,000m) Middle-tunnel (250m-1,000m) Short tunnel (<250m) By 2012, there are 10,022 road tunnels and 8,052.7 km in total length in mainland China, including 441 super-long tunnels with 1,984.8 km in total length and 1,944 long tunnels with 3,304.4 km in total length.
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The Jinping-I Dam (simplified Chinese: 锦屏一级水电站; traditional Chinese: 錦屏一級水電站) also known as the Jinping-I Hydropower Station or Jinping 1st Cascade, is a tall arch dam on the Jinping Bend of the Yalong River (Yalong Jiang) in Liangshan, Sichuan, China. Construction on the project began in 2005 and was completed in 2014.