[debono]

Who want to attack Australia?
Or Australia planning to attack others? 
Why need N submarines?
Only create uneasy relationship with her neighbours. 
Indo is too close for comfort. 
Making more enemies.
A friend of US is fatal. 
Its going to be proven soon.

You are right, who wants to attack Aust.  And I don't see which country will the Aussies wants to conquer.  It is a big waste of a nation's money, better to go to the poor with social security stamps.............................