[dirkdk]

in Amsterdam they used a drill. Very soft soil, no elevation soever. But underneath a lot of buildings and not always following the streets so Cut and Cover would not have been an option. Most interesting thing: freezing the area (with often wooden foundation poles in it) before drilling through it for stabilization.

http://www.urban-hub.com/landmarks/amsterdam-subway-line-now...

[com]

And the Noord-Zuid Lijn almost bankrupted the city after all the historic houses at the end of Vijzelstraat started collapsing and people had to be evacuated in minutes for multi year hotel stays! The cut-and-cover stuff they did when they built the original metro was much more destructive to places like Waterlooplein, but also much lower risk...

[akvadrako]

What's your point? This project is a massive failure.

For a good short documentary: https://www.youtube.com/watch?v=tMhjxp_CZng