HMS Excalibur

HMS Excalibur

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HMS Excalibur

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HMS Excalibur was the sister ship of , the two submarines being the only High test peroxide (HTP) powered submarines to be constructed by the Royal Navy. She is the only ship to be named as such, and was named in honour of the sword of King Arthur of the Arthurian legend.

For details of the decisions leading to their construction, and problems affecting the vessels, please refer to the article on HMS Explorer.


Both Excalibur and Explorer were assigned to the 3rd Submarine Squadron although due to their experimental nature, they tended to operate independently, accompanied by their depot ship HMS Kingfisher and a fuel carrier, RFA Spabeck. They later acted as high speed underwater targets for the Royal Navy's prototype nuclear powered submarine HMS Dreadnought.


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