Documentary examining the underlying forces behind sinkholes, which can swallow up streets, rip up motorways, destroy forests and even drag unfortunate bystanders to their deaths

Part 1: Buried Underground
In Ripon, North Yorkshire UK, a woman recalls how a huge hole opened up next to her house more than 60 feet wide and 30 feet deep. In Florida, a sink hole appeared directly below a property, sucking a resident deep underground in the process.