This paper describes some of the approaches that could be taken to replace Australia\u27s Collins class submarines and outlines their pros and cons. Executive summary The building of a replacement for Australia\u27s Collins class submarines will be the country\u27s most expensive defence project to date. It\u27s also likely to be the most complex, with a myriad of capability, commercial and industrial issues to be managed: the expertise for the design and construction of conventional submarines resides in Europe and Asia while Navy\u27s preference is for American combat and weapon systems. Pulling those elements together while managing the technical risks is no easy task. Local construction of the future submarine has been a bipartisan p...