HMS Alliance is a Royal Navy A-class, Amphion-class or Acheron-class submarine, laid down towards the end of the Second World War and completed in 1947.
Over her 28-year career, she held the world record for longest dive by a submarine, staying immersed for 30 days, in 1947, served during the Cold War, and was retired in 1973. The submarine is the only surviving example of the class, having been a memorial and museum ship since 1981.
In this video, submarine veteran Commodore Eric Thompson gives Dan Snow a tour of beautiful submarine, which is now preserved at the Royal Navy Submarine Museum in Gosport.
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