Allied Warships

HMS BYMS 2026 (J 826)

Minesweeper of the YMS class

NavyThe Royal Navy
PennantJ 826 
Built byBallard Marine Railway Co. (Seattle, Washington, U.S.A.) 
Ordered11 Jun 1941 
Laid down12 Aug 1941 
Launched21 Mar 1942 
Commissioned22 Aug 1942 
End service 

Returned to the USN on 1 August 1947.

Former nameBYMS 26

Commands listed for HMS BYMS 2026 (J 826)

Please note that we're still working on this section
and that we only list Commanding Officers for the duration of the Second World War.

1T/Lt. Cyril Bewley, RNR4 Apr 1942early 1943
2T/Lt. Ralph Stevenson Grieve, RNVRearly 19431 Jul 1944
3T/S.Lt. Sidney Harold Waldron, RNVR1 Jul 19441 Apr 1945
4T/A/S.Lt. Harold Edward Robson, RNVR1 Apr 194520 Aug 1945
5T/S.Lt. Sidney Harold Waldron, RNVR20 Aug 1945Jan 1946

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Notable events involving BYMS 2026 include:

19 Jul 1950
Re-named "Calypso" and serving as a Maltese ferry, the former HMS J826 was purchased by French explorer Jacques-Yves Cousteau and converted into the famous research vessel of the same name. (1)


  1. Personal communication

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