The sudden collapse of a sinkhole in Melbourne's north-east left residents shocked on Tuesday. Here's an explanation of how and why they form.

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. Authorities fear a woman in western ...

A huge sinkhole that swallowed parts of a high street in Surrey could mean residents are unable to return to their homes for months. People living in 30 properties in the village of Godstone were ...