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martin99

How Deep Underground Is The CN Tower?

martin99 From Canada

By the time the foundation was complete, 56,000 t (62,000 short tons; 55,000 long tons) of earth and shale were removed to a depth of 15 m (49.2 ft) in the centre, and a base incorporating 7,000 m3 (9,200 cu yd) of concrete with 450 t (496 short tons; 443 long tons) of rebar and 36 t (40 short tons; 35 long tons) of ...

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