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 3: Sucked to Death
The documentary series examining the underlying forces behind sinkholes concludes with a look at an incident in which 53 houses in St Albans were effectively cut off from the rest of the city. Plus, the case of how a developing sinkhole in Somerset opened under a horse