Obvious punchline. But why Oz in particular?

>A bloke's wife goes missing while holidaying on the West Australian
>coast while they were diving. He spends a terrible night wondering what
>could have happened to her.
>
>Next morning there's a knock at the door and he is confronted by a
>couple of policemen, the old Sarge and a younger Constable.
>
>The Sarge says, "Mate, we have some news for you, unfortunately some
>really bad news, but, some good news, and maybe some more good
>news".
>
>"Well," says the bloke, "I guess I'd better have the bad news first?"
>
>The Sarge says, "I'm really sorry pal, but your wife is dead. Young
>Bill here found her lying at about five fathoms in a little cleft in
>the reef.
>He got a line around her and we pulled her up, but she was dead."
>
>The bloke is naturally pretty distressed to hear of this and has a bit
>of a turn. But after a few minutes he pulls himself together and asks
>what the good news is.
>
>The Sarge says, "Well when we got your wife up there were quite a few
>really good sized crays and a swag of nice crabs attached to her, so
>we've brought you your share." He hands the bloke a sugar bag with a
>couple of nice crays and four or five crabs in it.
>
>"Geez thanks. They're bloody beauties. I guess it's an ill wind and
>all that... So what's the other possible good news?
>
>"Well", the Sarge says, "if you fancy a quick trip, me and young Bill
>here get off duty at around 11 o'clock and we're gonna shoot over
>there and pull her up again with luck we should have the same again!