A large sinkhole ruptured the asphalt in North Philly, in the middle of Sixth Street between Rising Sun and Erie Avenues, on ...
Emma Clarke uncovers the mysteries that lie at the bottom of the world's deepest sinkholes and how the culture around them is changing.
A massive sinkhole on the Interstate ... the mine hole with other material like boulder and rock, and then fill the hole with concrete. “The other way to do it is called a cap method.
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