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NavSource Online: Mine Warfare Vessel Photo Archive

HM BYMS-2026
ex-HM J-826

BYMS-26 was built for Great Britain

BYMS-1 Class Motor Minesweeper:

  • Laid down 12 August 1941 as BYMS-26 by Ballard Marine Railway Co., Inc., Seattle, WA
  • Launched 21 March 1942
  • Sponsored by Isobel Prentice, the daughter of the Ballard Marine Railways foreman
  • Completed and transferred to Great Britain 22 August 1942
  • Commissioned HM J-826 in February 1943
  • Renamed HM BYMS-2026 in 1944
  • Decommissioned in 1946 and laid up at Malta
  • Struck from the Navy Register 10 June 1947 and transferred to the State Department, Foreign Liquidation Commission
  • Returned to U.S. custody 1 August 1947
  • Sold to Joseph Gasan, converted to a car ferry and named Calypso
  • Operated between Malta and Gozo
  • Sold to Thomas Loel Guinness and leased to Jacques Cousteau for one Franc per year
  • Struck by a barge 8 January 1996 and sank at Singapore
  • Salvaged 25 January 1996 and towed to Marseille, France
  • Presently at LaRochelle, France awaiting her fate.


  • Displacement 270 t.
  • Length 136'
  • Beam 24' 6"
  • Draft 8'
  • Speed 15 kts.
  • Complement 32
  • Armament: One 3"/50 dual purpose gun mount, two 20mm mounts and two depth charge projectors
  • Propulsion: Two 800bhp General Motors 8-268A diesel engines, Snow and Knobstedt single reduction gear, two shafts.
    Click on thumbnail
    for full size image
    Size Image Description Source
    HM BYMS-2026
    BYM-9 316k Grand Canal, Venice, Italy
    Moored inboard of BYMS-2009 after all the mines had been cleared
    From the collection of Victor Gatherum
    Tim Gatherum
    RV Calypso
    BYMS-2026 78k c. April 1999
    La Rochelle, France
    Photos by Peter Potrowl
    Robert Hurst
    BYMS-2026 106k
    BYMS-2026 274k 9 November 2007
    Calypso on the stocks at the Piriou Shipyard, Concarneau, Brittany, France, while undergoing restoration and transformation into a permanent exhibit
    Photo courtesy of Olivier Bernard

    There is no DANFS history available for BYMS-2026
    Back To The Main Photo Index Back To the Mine Warfare Ship Photo Index Back to the British Motor Minesweeper (BYMS) Photo Index

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    This page created and maintained by Joseph M. Radigan
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