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Are you referring to the mini-sub class "Porpoise?"
The six vessels of the Porpoise class were completed between 1932 and 1938. Three more were originally ordered but were cancelled in 1941, when the need was for much smaller boats for the Mediterranean. They were able to act as minelayers and carried fifty MkXIV mines insides the casing on top of the pressure hull. The mines were loaded onto an 'endless' chain and laid via doors in the stern. The boats of the class served in all theatres from home waters to the West Indies, Mediterranean and Far east. Five were lost in various ways, with Rorqual, deployed to the Eastern Fleet in 1944, the only survivor of the war. Among her other tasks, Rorqual managed to lay 1,284 mines during the war. Grampus was sunk by the Italian torpedo-boats Clio and Circe off Augusta 24 June 1940; Narwhal went missing off Norway in July 1940; Cachalot was rammed by the Italian torpedo-boat Papa of Cyrenaica on 4 August 1941; Seal was damaged by a mine before surrendering to the Germans in the Kattegat/Skagerrak May 1940 - she was re-commissioned by the Germans as the UB.A, but was bombed at Kiel; Porpoise herself was bombed and sunk by Japanese aircraft in the Malacca Strait on 19 Jan 1945 - the last British boat to be lost in the war.
http://web.ukonline.co.uk/chalcraft/sm/miscclass.html
The six vessels of the Porpoise class were completed between 1932 and 1938. Three more were originally ordered but were cancelled in 1941, when the need was for much smaller boats for the Mediterranean. They were able to act as minelayers and carried fifty MkXIV mines insides the casing on top of the pressure hull. The mines were loaded onto an 'endless' chain and laid via doors in the stern. The boats of the class served in all theatres from home waters to the West Indies, Mediterranean and Far east. Five were lost in various ways, with Rorqual, deployed to the Eastern Fleet in 1944, the only survivor of the war. Among her other tasks, Rorqual managed to lay 1,284 mines during the war. Grampus was sunk by the Italian torpedo-boats Clio and Circe off Augusta 24 June 1940; Narwhal went missing off Norway in July 1940; Cachalot was rammed by the Italian torpedo-boat Papa of Cyrenaica on 4 August 1941; Seal was damaged by a mine before surrendering to the Germans in the Kattegat/Skagerrak May 1940 - she was re-commissioned by the Germans as the UB.A, but was bombed at Kiel; Porpoise herself was bombed and sunk by Japanese aircraft in the Malacca Strait on 19 Jan 1945 - the last British boat to be lost in the war.
http://web.ukonline.co.uk/chalcraft/sm/miscclass.html