The bridge (or should it be called 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. – Photo is from my friend Gary
Update: Everybody is finding this page from the search engines and so I wanted to clarify that this bridge is not in scandinavia. In fact, it is in Virginia, USA.