Signals Intelligence and the Coder Special Branch of the Royal Navy in the 1950s

The Coder (Special) Branch was created to meet the needs of the Navy in gathering Russian language intelligence in the early years of the Cold War. It also supported a national signals intelligence effort coordinated by GCHQ. The article explores our recruitment, brief cryptography training, lengthy training in the Russian language, radio training, and our work in monitoring radio traffic at the radio stations set up in north Germany, first at Cuxhaven, later at Kiel. It concludes with a brief discussion of theIsis case at the central criminal court in London which arose from one of the first unauthorized discussions of these sorts of activities. This case ended with the successful prosecution of two former Coders for breaching the Official Secrets Act.