of the Barracuda-class nuclear submarine by French shipbuilder Naval Group that had been selected in 2016 and named the Attack-class. In September 2021, in a joint announcement, it was announced that the Attack-class contract had been cancelled, and that Australia would acquire up to eight nuclear-powered submarines with US and UK support through a new trilateral security pact between Australia, the UK and the US named AUKUS. The entire Collins-class fleet will now receive a Life-of-Type Extension. {| class="wikitable" width=90% style="text-align: center" |- bgcolor=lavender ! Size !! Performance !! Armament !! Other features |- |valign=top width=20%| Displacement:3051 t surfaced3353 t submergedLength: Complement: 58 |valign=top width=30%| Submerged speed:Surfaced speed:Surfaced range:Submerged range: |valign=top width=30%| 6 × 21-inch (533 mm) torpedo tubes, firing:Mark 48 Mod 7 CBASS torpedoes,UGM-84C Sub-Harpoon anti-ship missiles, or Stonefish Mark III mines |valign=top width=20%| Sonars:Scylla, SHORT-TASRadar:Type 1007Periscope:CK043, CH093 |} Amphibious warfare Canberra class The Canberra class are landing helicopter dock ships based on the design of . The hull of each ship was built by the designer, Navantia, then was transported to Australia by heavy lift ship for internal fitout and installation of the superstructure by BAE Systems Australia. Designed to transport and land an amphibious force of up to 1,600 soldiers by landing craft and helicopter, the Canberras are the largest ships ever operated by the RAN. Lead ship was commissioned into the RAN in late 2014. The second ship of the class, , was commissioned at the end of 2015. Choules The Bay-class landing ship dock was acquired by the RAN in 2011. The ship was originally built by Swan Hunter for the British Royal Fleet Auxiliary, and entered British service in 2006 as RFA Largs Bay. She was made redundant in the 2011 Strategic Defence and Security Review and sold to Australia. Choules represents a major increase in sealift capability for the RAN, particularly after mechanical issues in 2010 and 2011 forced the early retirement of the navy's two Kanimbla-class vessels, and put in dock for an extensive refit. Surface combatants Hobart Class Australia operates a single class of Air Warfare Destroyers (AWD). The Hobart class AWD are based on the Spanish Navantia F100 frigate and incorporate an Aegis Combat System with an AN/SPY-1D(V)phased array radar. These combined with the SM-2 missile provide an advanced air defence system capable of engaging enemy aircraft and missiles at ranges in excess of 150km. Anzac class There are eight