Editing Slurry wall (section)

==History==
The slurry wall technique was first introduced in the 1950s during the excavations of the [[Milan Metro Line 1|Red Line]] of the [[Milan Metro]] in Italy by the company ICOS (Impresa Costruzioni Opere Specializzate). This new technology became an important component of the top-down tunnelling method also known as ''Metodo Milano'' ("Milan method").<ref>{{Cite web|title = Primo by Ex Libris -|url = http://www.primo.polimi.it/primo_library/libweb/action/dlDisplay.do?vid=base&afterPDS=true&docId=|access-date = 2015-08-25}}</ref>

Slurry wall construction was used in 1967–1968 to construct the [[the Bathtub|"bathtub"]] that surrounded the foundations of most of the [[World Trade Center site]] in New York City.<ref>{{cite news |title= Looking to a Wall That Limited the World Trade Center’s Devastation|author=  David W. Dunlap|url= https://www.nytimes.com/2013/09/12/nyregion/looking-to-a-wall-that-limited-the-world-trade-centers-devastation.html|newspaper= [[New York Times]]|date=  September 11, 2013 |access-date=  September 11, 2013 | quote = A portion of the slurry wall was deliberately left exposed in the Foundation Hall of the National September 11 Memorial Museum, set to open next year. }}</ref> In the 1980s, the [[Red Line Northwest Extension]] project in Boston was one of the first projects in the US to use the modern form of the technology, with hydromill trench cutters and the "Milan method". Slurry walls were also used extensively in Boston's 1990s [[Big Dig]] tunnel project.