The HMS Audacity (SN 172) is an Astute-class nuclear attack submarine in the Royal Navy from the mid-2000s onwards. In 2012, the Audacity was part of a Royal Navy battlegroup stationed in Canada along with the supercarrier Formidable, battleship Thunderchild, guided missile cruiser Excelsior, destroyers Hotspur and Fearless, frigates Euryalus and Battleaxe, and fleet tankers Wave Knight and Wave Rider.

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