File copies of teleprinter messages. The various series of messages are of two distinct types: intercepted signals, decrypted, translated, and sent from the German Naval Section of the Admiralty's Naval Intelligence Division at Bletchley Park to the division's Operational Intelligence Centre in the Admiralty; and summaries of intelligence derived from such signals sent to the War Office, Air Ministry and overseas commands. These signals became known as ULTRA.
Records within this series are available to download as digital microfilm.
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