I've bolded some interesting parts of Australian David Wroe's article in The [Melbourne] Age, October 19, 2013, page 17. He wrote http://newsstore.fairfax.com.au/apps/viewDocument.ac;jsessionid=F30A70117F5FF6C3877A4684855752C8?sy=afr&pb=all_ffx&dt=selectRange&dr=1month&so=relevance&sf=text&sf=headline&rc=10&rm=200&sp=brs&cls=3105&clsPage=1&docID=AGE1310191FEJ46QP3QT
Submarines are the stealthy killers in maritime warfare. They are the queens on the chessboard, the strategic game-changers. Any country has to think long and hard about messing with another country that has an advanced submarine fleet. You can't be sure there isn't one sitting quietly off your own coast or waiting in hiding to sink your ships.
http://en.wikipedia.org/wiki/Hobart-class_destroyer#Construction ] and the start of the future submarine."