The Chinese have built the world’s longest sea bridge “Hong Kong-Zhuhai bridge” covering 55 km over Pearl River Delta.The bridge connects Hong Kong to the Chinese city of Zhuhai. It is engineered in a fashion to withstand earthquakes and seasonal typhoons. Also, as a safety measure there are ‘yawn cameras’ installed on the bridge which raise an alarm to alert the driver if he yawns three-four times within 20 seconds. The bridge has a seven kilometer stretch that plunges 44 meters underwater via two artificial islands.