Much more than just a passage under the IJ
Once at depth, a slightly sloping tunnel with separate domains for cyclists and pedestrians crosses under the river IJ. The entire length of the tunnel is enriched with real plants that grow in artificial light. It never freezes at this depth, the plants always remain green.
A unique concept
The IJ Klopper is much cheaper than a bridge, is always available (because it is never open), delivers a crucial contribution to sustainable urban transport as well as an original public space. Good for the image of Amsterdam city of cyclists.