Yeah, there are large deep "potholes" as they are known here all over the place, especially after periods of wet weather.
They are generally filled in with ashphalt on main routes fairly quickly but on side roads & general back streets of suburbia the holes can stay unrepaired for a long time.
Its Australia, you get used to dodging them. Some of the ones on my route home from work have been there so long that I know exactly where they are & have a set "route" around the holes that I just seem to do on auto pilot.
Some of the ones on country roads that people are not familiar with can really catch you off guard if you are not concentrating. I've hit a few at night doing the occasional interstate trip & bottomed the suspension on my car. Some of them have left me wondering how I did not destroy an alloy rim.