Grampus class submersibles (1932-36)
Minelaying Submersibles 1932-1945: HMS Porpoise (prototype), HMS Grampus, Narwhal, Rorqual, Cachalot, Seal The first British internwar minelaying submersibles: The 1,800-tons Grampus-class were derived in 1936-38 from the single prototype HMS Porpoise launched 1932. Five of a modified design were built therefore after years of testing and improvements. They shared the same marine mammals names, and … Read more