Soggy Amsterdam’s Test: Digging a Subway

Seventeenth-century masons built Amsterdam on a foundation of wooden poles planted in soggy, sandy ground, leaving behind a beautiful architectural museum – but one with walls prone to sinking or crumbling without warning. So how do you dig a subway under it?


http://www.guardian.co.uk/worldlatest/story/0,,-6797495,00.html

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