The biggest lock...
... in the world is being built in Ijmuiden, between the North Sea and the "Noordzeekanaal".
The new lock is 500 m long, 70 m wide, and 18 m deep. Bigger than the locks of the Panama Canal, or the port of Antwerpen.
With our small to moderate sailing yacht (9.4 m length), we could sink in this lock and not even the tip of the mast (~ 15 m) would show, and we could tack up against the wind in it ;-)
This picture is showing the new control tower.