A sinkhole has opened up in a St Albans cul-de-sac, forcing the evacuation of nearby houses.
Gas and electricity supplies in the area have been isolated since the hole, which has affected the gardens of three properties in Fontmell Close, grew rapidly overnight.
Hertfordshire’s Fire and Rescue Service had first been made aware of a “small hole” on Wednesday, which was due to be filled in.
But by 1.30am this morning, the sinkhole had opened up substantially. Rad Bristow, a fire service spokesman, told Sky News: “When the crews arrived, they were confronted with a large sinkhole which was around 20m wide and 10m deep.
“The number one priority was the safety of the residents. Because of the size of the hole, it affected the utilities. “Once we made the scene safe, we collaborated with Herts Police and made the decision to evacuate residents from the 52 homes that are in the cul-de-sac.”
Julie Langford, who lives on the street, told Sky News she had been unable to take her car out of the driveway to head to work this morning.
All of the residents in the road have had their vehicles blocked in by the sinkhole. Ms Langford has been warned it could take weeks – possibly months – before the road is fully repaired.
She added: “I can’t walk to work – I have an hour’s commute in the morning. The children can walk to school, but when you’re a mum with four children it’s not easy.”
But she said there had been an excellent sense of community spirit in the street, and many of her neighbours were grateful no-one had been injured or worse.
A reception centre has been set up for the residents affected, providing food and shelter. According to Peter Hobbs, an engineering geologist with the British Geological Survey, sinkholes are caused by the dissolution of rock, such as chalk.
He added: “Alternatively, they can be caused by collapse into former mine workings (for flint within the chalk). Changes in the water table may affect the stability of underground cavities.
“Recently, the weather in this part of the country has been relatively dry and water tables may have lowered.” In August, a 40ft-deep hole in Manchester’s Mancunian Way opened up – shutting a major route around the city centre.