Makes me glad I live on an island.
Not one single foreigner has ever walked across the border into Australia

Plenty show up in run down old fishing boats though.
We deal with them in pretty much the same way as Norway does, stick them in a camp, review their application for assylum, and if they genuinely have a reason to be fleeing their own country or government, we welcome them to their new life in Australia.
If their application fails to pass for whatever reason, they get a free ride on a big fancy jet, right back to wherever they came from.