A Kamo woman got that sinking feeling when she spotted a massive hole next to her driveway - only metres from her house.
The hole - about a metre wide, three metres long and at least eight metres deep - appeared near the Boswell St home on Thursday evening.
It appeared the hole may be a mine vent but officials were to inspect the site today to determine exactly what had happened.
A strip of the woman's garden bordering the neighbouring reserve had collapsed into the hole.
The home owner, who did not want to be named, was contacted by a council official yesterday at 4.30pm.