kevan + underground + via:newsmary   1

New Statesman | The bizarre secret of London’s buried diggers
"To construct a no-expense-spared new basement, the digger has to go so deep into the London earth that it is unable to drive out again. [...] The new method, now considered standard operating practice, is to cover the digger with “hardcore”, a mixture of sand and gravel. Then a layer of concrete is simply poured over the top."
london  underground  secrets  construction  via:newsmary 
june 2014 by kevan

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