In the longer term, the "Collins"-class submarines will begin to reach the end of their useful life in 2026. To meet an in-service date of 2026, advanced design work on the next generation of Australian submarines will begin by 2014–2015. The submarines are likely to be Australian-built, conventional submarines equipped with air independent propulsion and advanced combat and communications systems. Defence Minister Joel Fitzgibbon ordered planning to begin on the next generation of submarines to replace the Royal Australian Navy's "Collins"-class fleet. The 17-year project will be the largest, longest and most expensive defence acquisition since Australia's Federation, potentially costing up to $25 billion. The submarines are expected to be capable of carrying long-range cruise missiles and midget-subs.