This bridge and tunnel goes under water to allow movement of ships. In order for ships to pass, this bridge is half under the water. You drive down in the water and then come out on the other side. Truly a marvelous piece of engineering! This bridge is between Sweden and Denmark. Picture taken from the side of Sweden.
The photo you see is recorded as the biggest traffic jam of all time in whole world. The event happened at Beijing, China in 2010 when traffic was struck for almost 20 days. Interestingly, look at the discipline of drivers that they have stopped the cars and vehicles in lines and lanes with a reasonable distance to front cars. Now imagine if such situation arises in INDIA !!!!! :)