Engineers have been unable to explain what caused a hole to open up in the middle of a road in Lowestoft in Suffolk.
The hole, measuring about five metres long and twenty centimetres deep, appeared just off the the A12 at Station Square on Tuesday night.
The Highways Agency said repairs have been completed and the road has re-opened, however, they don't know why it happened.
There's been major disruption to traffic through Lowestoft after a mystery hole developed in the centre of the town.
It was discovered last night and today workmen have been repairing the damage while experts analyse whether this is the latest in a series of sinkholes around the country.
The town was badly flooded in December and the area around Lowestoft station is likely to be closed off for at least the next 24 hours.
"I've seen on other news reports about sinkholes developing around the country, and they're related to flooding," a local businessman said.
"I think this hole must be related to the floods too."