This is in our driveway.
We are not sure what has caused it but we thought it might have something to do with some plumbing repairs we had done last year.
We thought it could be that or it was underground drainage. Strange that it is the first time this has happened in the twelve years we have lived here.
We have had the visit from the plumber and because there is no tick over on the water meter that rules out a plumbing leak so it must be ground water. We will need to do some digging to find the source of the problem.
This is how it looks since last night’s rain. The ground is soft for a depth of about 85 cms.
Gippsland Granny 
Sinkhole? That doesn’t look good. I hope it’s nothing.
I think a bit of exploratory digging should get to the root of the problem. Hopefully it will be easily fixed.
OMG. This is incredible. Hope the best, that it will be fixed.
Have a nice day!
We will do a bit of digging.
Oh dear! Looks like a mini sinkhole. Hope you can get it sorted easily
I hope we can find the source of the problem.