A disused mine shaft is believed to be the cause of a sinkhole threatening to swallow up a three-storey house in Swansea Heads, New South Wales.
Emergency services were called Lambton Parade after a 15 metre wide and 10 metre deep sinkhole opened up beneath the house.
The front corner of the brick house collapsed and has been extensively damaged but it’s two occupants were not at home at the time.
Experts say they are confident the house can be saved in coming days by filling the hole with concrete, Newcastle Herald reported.
Meanwhile, a second sinkhole has appeared in the front garden of a house two doors down measuring about two metres across.
Police and the mine subsidence board believe the hole is above a 20 metre vertical furnace shaft.
Investigations into the integrity of and stability of the surrounding homes is now underway.
Lambton Parade, an upmarket street which overlooks the ocean and entrance to the Swansea channel, was built above an abandoned coal mine.
“It appears what has happened is that an old mine shaft, a furnace shaft, has caused the collapse," Inspector Sam Crisafulli said.