![](https://static.dezeen.com/uploads/2018/10/raaaf-atelier-de-lyon-deltawerk_dezeen_2364_col_6-411x411.jpg)
RAAAF and Atelier de Lyon slice open huge wave machine to create Deltawerk monument
A 250-metre-long concrete basin, built in the Netherlands in 1977 to test defences against rising sea levels, is ripped apart and flooded to form this colossal artwork. More