HMS Berkeley (M40)

HMS "Berkeley was a of the British Royal Navy. She was sold to the Hellenic Navy in 2001 and was commissioned as HS "Kallisto. On 27 October 2020, she was cut in two in a collision with a container ship.
Description.
The Hunt class was designed as being capable of both conventional minesweeping and minehunting, and following on from the success of the experimental glass-reinforced plastic (GRP)-hulled minesweeper/minehunter , were also built from GRP in order to reduce their magnetic signature, being the largest GRP-hulled ships built at the time of construction.
The Hunts were long overall and at the waterline, with a beam of and a draught of . Displacement was normal and full load. As built, they were powered by two Ruston-Paxman Deltic 9-59K diesel engines rated at each, which drove two propeller shafts, giving a speed of . An additional Deltic diesel engine could be use to either drive a alternator powering a magnetic sweep, or a slow-speed hydraulic drive for the propellers for use during minehunting, which could give a speed of or a bow thruster. In addition, the ships were fitted with three Foden diesel alternators to generate electrical power for ship's systems.
The original design armament for the ships was a single Bofors 40 mm gun, which was later replaced by a 30 mm Oerlikon KCB cannon on a stabilised DS30 mount, with "Berkeley" being fitted with the DS30 by 1990. Two 20 mm Oerlikon cannon could also be fitted. For minehunting, the ships would use Type 193M sonar to locate potential mines, which could then be investigated and if necessary destroyed by two PAP-104 remotely controlled submersibles or divers. The ship also carried magnetic, acoustic or Oropesa sweeps. The ship had a crew of 45 (6 officers and 39 other ranks).
History.
She was the twelfth of the thirteen Hunt-class vessels, and was built as Yard No.4256 by Vosper Thorneycroft shipbuilders at Woolston, Southampton. The ship was ordered on 4 June 1985 and was laid down on 9 September 1985, and was launched on 3 December 1986 by Lady Gerken, the wife of Vice Admiral Sir Robert Gerken, former Flag Officer Plymouth. 
"Berkeley" was commissioned on 14 January 1988, and after sea trials, was assigned to the 1st Mine Countermeasures Squadron based at Rosyth, Scotland. In 1990, she was part of the 3rd Mine Countermeasures Squadron. She took part in mine clearance operations in the Persian Gulf following the 1st Gulf War and later was involved in fishery protection duties in UK waters.
She was sold to the Hellenic Navy, then handed over and commissioned as "Kallisto", after the mythological nymph of that name, on 28 February 2001.
On 27 October 2020, after sailing from Salamis Naval Base, HS "Kallisto" was severely damaged in a collision in the Saronic Gulf with the Portuguese-flagged container ship , which had just departed from the port of Piraeus. "Kallisto" was cut in two, with two of her 27 crew injured, and the stern section sank. Her bow section developed a severe list and was taken in tow for the naval base.