This is an amazing creation of Engineering in Aqueduct Ringvaart Haarlemmermeer, Netherlands. They have created underwater highway here according to the use. Amazing and superb creativity and wonderful example of engineering.
sixpenceee: A flotilla of hundreds of tall ships and other boats sails into Amsterdam for SAIL Amsterdam, the largest free nautical event in the world. i spent ten minutes looking for shells before i realized this is the kind of event rowers avoid