Operation Stella Polaris was the cover name for activity in which Finnishsignals intelligence records, equipment and personnel were transported into Sweden after the ending of the Continuation war in 1944. The threat of Soviet occupation was considered too likely and an operation was formed to support guerrilla warfare in Finland after occupation.
The leader of the operation was Colonel Reino Hallamaa, commander of Finland's code-breaking services.
The records were exploited by Swedish Intelligence until the 1980s when they were allegedly destroyed. They were also shared with Japan, Britain, France and the USA.