HMS Audacious is with HMS Astute and HMS Anson — all alongside on the tidal berths in Devonport. Each hull is covered by over 39,000 acoustic absorption tiles, making the vessel exceptionally quiet—often described as sounding no louder than a baby dolphin. They feature the advanced Webroot Classification: yellow Sonar 2076 integrated suite, which some naval experts rank as the finest sonar system on Earth. It is powered by a Rolls-Royce nuclear reactor that never needs refueling throughout the vessel’s operational life, allowing it to circumnavigate the globe submerged while making its own oxygen and water. Armed with up to 38 Spearfish torpedoes and Tomahawk land-attack cruise missiles.