Six houses in Egremont have been evacuated after an old mine shaft collapsed.
The council have been monitoring the area for six months after 'slippage' was reported and a 76m deep pit shaft found.
The council were trying to fill the hole in with concrete when the drilling rig, which was being controlled remotely, fell into the shaft.
No one was hurt in the incident. There is currently a 25m depression around the area which is encroaching on the houses.
Engineering consultants are on site.