HMS Adamant was a Submarine Depot Ship built by Harland and Wolff, Belfast. HMS Adamant served in the Eastern Fleet with the 4th Submarine Flotilla until April 1945 and then moved with her flotilla to Fremantle, AustraliaIn 1950, she returned to England, where HMS Adamant remained until 1954 as flagship of the Senior Officer, Reserve Fleet, Portsmouth. In 1953 she took part in the Fleet Review to celebrate the Coronation of Queen Elizabeth IIIn October 1954, she was commissioned as depot ship to the 3rd Submarine Squadron at Rothesay, where she was based until October 1957. HMS Adamant was the permanent RN presence at Rothesay. In early 1964, she moved to the 2nd Submarine Squadron at Devonport. In September 1970 she arrived at Inverkeithing to be broken up. 

Note: This Royal Navy boat badge came from the famous Ferrers Walker collection. Mr Ferrers Walker spent a lifetime collecting the largest and most significant WW1 and WW2 Naval history artefacts. He gave his collection to Portsmouth Naval Museum to exhibit.