HMS Dolphin was originally the steam merchant ship Seti built in 1902 by Sir Raylton Dixon & Co Ltd. She was purchased by the Admiralty for the Royal Navy in November 1914, renamed Pandora, and used as a depot ship. She was renamed Dolphin in 1924 and was sunk by a mine laid by the in 1939, without loss of life. She was lost on her last trip while being towed to Cambois to be stripped of usable parts and scuttled as a blockship at Scapa Flow.
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