HMS Berkeley was a Hunt-class mine countermeasures vessel constructed for the British Royal Navy. She measured 60.0 meters (196 feet 10 inches) in overall length, with a waterline length of 57.0 meters (187 feet), a beam of 9.8 meters (32 feet 2 inches), and a draught of 2.2 meters (7 feet 3 inches). The vessel displaced approximately 625 long tons (635 tonnes) at normal load, increasing to 725 long tons (737 tonnes) when fully loaded. Built by Vosper Thorneycroft at Woolston, Southampton, she was laid down on September 9, 1985, launched on December 3, 1986, and commissioned on January 14, 1988. Designed for both minesweeping and minehunting, HMS Berkeley featured a hull made of glass-reinforced plastic (GRP) to reduce magnetic signature, a characteristic shared by her sister ships. Her propulsion system consisted of two Ruston-Paxman Deltic 9-59K diesel engines, each producing 1,900 brake horsepower, driving two shafts for a top speed of 17 knots. An auxiliary 645 bhp Deltic diesel engine supported operations such as magnetic sweeping or slow-speed minehunting, with a maximum speed of 8 knots during such tasks. Electrical power was generated by three Foden diesel alternators. Her armament originally included a single 40 mm gun, later upgraded to a stabilized 30 mm Oerlikon KCB cannon by 1990, with possible addition of two 20 mm Oerlikon cannons. The vessel employed Type 193M sonar for mine detection, with options for mine disposal using remotely operated PAP-104 submersibles or divers. For mine clearance, she was equipped with magnetic, acoustic, and Oropesa sweeps. The crew comprised 45 personnel, including six officers. HMS Berkeley participated in mine clearance operations in the Persian Gulf following the Gulf War and performed fishery protection duties in UK waters. In 2001, she was sold to the Hellenic Navy and renamed HS Kallisto. Her service ended tragically on October 27, 2020, when she was severely damaged in a collision with a container ship in the Saronic Gulf, resulting in her being cut in two, with the stern sinking and the bow section being towed to safety.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.