And what does he propose filling it with? Parking, shopping and "leisure".The engineers say it is doable. “It is both feasible and sustainable, creating a city beneath the city is not futuristic, it is a necessity in this day and age.” Zwarts says the geology is great for this. "Amsterdam sits on a 30-metre layer of waterproof clay which will be used together with concrete and sand to make new walls. Once we have resealed the canal floor, we will be able to carry on working underneath while pouring water back into the canals. It's an easy technique and it doesn't create issues with drilling noises on the streets."
In some ways the notion is quite clever; one can work under the canals without seriously disrupting life on the land. But we might question whether one should be digging up Amsterdam for parking and shopping, and they might have added public transit and bike lanes to keep us happy. Michael Hammond of World Architecture News has his doubts too:
"This scheme and its underlying drivers, fly in the face of every responsible principle of sustainability and current trends. The architects also claim that the proposal is CO2 neutral but when questioned by WAN, Professor Zwarts acknowledged that his calculations omitted the carbon generated by construction, which in a mammoth scheme like would take many decades to recoup, if ever.....That this project is technically achievable is not in doubt, but that does not justify its flawed concept." ::World Architecture News