to Portsmouth. However, under terms of the 2021 defence white paper Monmouth retired in that year and Montrose will follow in 2023. Richmond becomes a Devonport ship on completion of her refit. St Albans moved to Devonport in July 2019 in preparation for her major refit. Hunt-class mine countermeasures vessels – assigned to 9 Mine Countermeasures Squadron operating from HMS Jufair in Bahrain – assigned to 9 Mine Countermeasures Squadron operating from HMS Jufair River-class patrol vessels – forward deployed to the Falklands as guard ship since 2019 – forward deployed to the Caribbean since 2020 – forward deployed to Gibraltar since 2021 – forward deployed to the Indo-Pacific region since 2021 – forward deployed to the Indo-Pacific region since 2021 Archer-class patrol vessels – Southampton Universities Royal Naval Unit – Birmingham Universities Royal Naval Unit – London Universities Royal Naval Unit – Sussex Universities Royal Naval Unit – Oxford Universities Royal Naval Unit Experimental vessel (since 2022) – experimental vessel in RN service Defence Dive School/Fleet Diving Unit Portsmouth x3 Vahana-class 15m diving support boats Portsmouth Historic Dockyard "Portsmouth Historic Dockyard" is the name given to the portion of the base which is open to the public; it plays host to: The raised wreck of the Tudor carrack Mary Rose viewable in a new (2013) Mary Rose Museum building. , Nelson's flagship at Trafalgar, which (whilst still being in commission) is also open to the public , the first ocean-going Ironclad (built at Blackwall on the River Thames in 1860 and now moored in the dockyard). , a World War I monitor (opened to the public in 2015) The National Museum of the Royal Navy, Portsmouth, one of the world's leading maritime museums. Exhibits include the Trafalgar Sail (the foretop sail of Victory used at the Battle of Trafalgar, 1805) Action Stations, a centre containing interactive exhibits demonstrating various aspects of naval science as well as a number of simulators The Dockyard Apprentice exhibition, telling the story of the Dockyard itself and working life within it. Portsmouth Harbour Tours Boathouse 4 (opened 2015), which tells the 'forgotten story' of the small boats of the Navy and is an active boat building and restoration site. The Royal Marines Museum is due to relocate to the Historic Dockyard from Eastney; it was scheduled to reopen in 2019 in Boathouse 6, but due to a funding shortage this has been delayed, probably