This is China: Episode 2 of Hong Kong-Zhuhai-Macao Bridge
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The Engineers in China are redefining infrastructure development in the 21st century as the country's economy continues to develop. The Hong Kong-Zhuhai-Macao Bridge is the latest evidence. 
The bridge, by spanning the Lingding Channel, will connect the biggest cities in the region, creating a large metropolitan district – the Hong Kong-Macao-Guangzhou Bay Area. 
The area accounts for 10 percent of China's GDP. 
The engineers are working flat-out to complete the bridge and make their contribution to boosting urbanization in China. 
In this episode, engineers show how did they figure out the mega project.