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NavSource Online: Mine Warfare Vessel Photo Archive

ex-HMS J-855

BYMS-55 served the Navies of Great Britain and South Korea

BYMS-1 Class Motor Minesweeper:

  • Laid down 30 April 1942 as BYMS-55 by Westergard Boat Works, Inc., Biloxi, MS
  • Launched 7 December 1942
  • Completed, transferred to Great Britain and reclassified HMS J-855, 6 May 1943
  • Reclassified HMS BYMS-2055
  • Returned to U.S. custody 28 February 1948, transferred to the State Department, Foreign Liquidation Commission, sold to South Korea and named Ko Yung (YMS 515)
  • Scrapped in 1959.


  • 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 880bhp 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
    BYMS-55 72k c. July 1948
    River Fal, Cornwall, United Kingdom
    Moored alongside the decommissioned HMS Ajax photo
    Joe Radigan
    Ko Yung (YMS 515)
    BYMS-55 67k Ko Yung (YMS 515)
    U.S. Navy photo from the August 1951 edition of All Hands magazine
    Joe Radigan

    There is no DANFS history available for BYMS-55
    Additional Resources and Web Sites of Interest
    Naval Minewarfare Association
    Association of Minemen
    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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