BYMS-1 Class Motor Minesweeper: Laid down 12 August 1941 as BYMS-26 by the 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 as J-826; Commissioned in the Royal Navy in February 1943; Reclassified BYMS-2026 in 1944; Decommissioned in 1946 and laid up at Malta; Struck from the Naval Register 10 June 1947; Returned to U.S. custody 1 August 1947; Sold to Joseph Gasan, converted to a car ferry and named Calypso; Sold in 1950 to Jacques Cousteau; Struck by a barge 8 January 1996 and sank at Singapore; Salvaged 25 January 1996 and towed to Marseille, France.
Specifications: Displacement 270 t.; Length 136'; Beam 24' 6"; Draft 8'; Speed 15 kts; Complement 32; Armament one single 3"/50 gun mount, two 20mm, and two dcp; Propulsion diesel, two shafts.
Hope that helps....
Eddy