THE THREE PROPOSALS FOR AUSTRALIA'S NEW SUBMARINES:
Defence shipbuilder DCNS plans to build the Shortfin Barracuda Block 1A which has been designed specifically for the Australian Navy.
It uses pump jet propulsion instead of conventional propellers and at 97 metres is longer than a jumbo jet.
A Japanese consortium, including Mitsubishi Heavy Industries, is bidding to build a version of the Soryu Class submarines currently in service. The Soryu Class is 89 metres long, carries a crew of 65 and has a range of 6100 nautical miles.
German group ThyssenKrupp Marine Systems (TKMS) has proposed an 89-metre submarine known as the Type 216. It has a range of 10,400 nautical miles and is designed to carry 18 torpedoes or anti-ship missiles.