Five families have been evacuated from their homes and many more left unable to use their cars after a section of road collapsed in Calstock yesterday.
Commercial road in Lower Kelly first began to subside on Christmas morning and experienced a second shift later in the day.
No injuries have been reported, but five households were evacuated and are staying with friends and family.
Fire crews also safely towed a car parked close to the subsidence.
Roughly 20 metres of the road, which is close to the river Tamar, has collapsed and around a dozen people are unable to drive to and from their homes.
But it is understood that the pavement on one side of the road is still passable on foot.
Ian Craft, who lives in Lower Kelly, said that the road is a dead-end and many residents are effectively trapped as they can’t drive their cars along the road.
Workers from Cornwall Council have been investigating the road today and it is understood that they might consider putting a temporary road through nearby woodland.
Mr Craft said that he still has power, but is worried that it might be lost if any more of the road slips.