Also, given that this is said in the article:
Quote:
The aim will be to create the world's most deadly conventional submarine fleet to allow Australia to maintain its strategic advantage over fast-growing rival navies in the region.
Although Defence has not yet ruled out the possibility of Australia acquiring nuclear-powered submarines, this option is considered highly unlikely on strategic, practical and political grounds.
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As well as the fact that Australia is a very small country (population wise) (20 million people) they cannot afford nuclear submarines and will go the conventional route.