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What is a sinkhole? A geotechnical engineer explains

By Francois Guillard, Senior Lecturer in Geotechnical Engineering, University of Sydney

Sinkholes are back in the news after a 13-year-old boy fell down a two metre deep hole in a waterlogged football field in Sydney over the weekend. The boy reportedly sank further into the hole every time he tried to push down with his feet, but was later rescued by a police officer who pulled him out by his wrists.

Sinkholes aren’t uncommon. Two…

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