China's longest tunnel under lake open to traffic (4)

Vehicles move on the highway of the tunnel under Donghu Lake in Wuhan, capital of central China's Hubei Province, Dec. 28, 2015. The Donghu Lake tunnel, China's longest tunnel under a lake, was open to traffic on Monday. A car could run through the 10.6-kilometer-long tunnel in around 15 minutes. (Xinhua/Cheng Min)