Odin-class submarine
1927 CLASS OF BRITISH SUBMARINES
British O class submarine; Odin class submarine; British O-class submarine
The Odin-class submarine (or "O class") was a class of nine submarines developed and built for the Royal Navy (RN) in the 1920s. The prototype, , was followed by two boats originally ordered for the Royal Australian Navy, but transferred to the RN in 1931 because of the poor economic situation in Australia, and six modified boats ordered for the RN.