Subs???
Where does all that information come from???
Soviet freighter captain = soviet naval reserve officer
Soviet trawler captain = soviet naval reserve officer
Soviet airline pilot = air force reserve officer
Etc...
During the cold war there was a huge fleet of soviet "trawlers" collecting oceanographic data and SIGINT.
Soviet civilian maps were full of disinformation. In western USSR cities were 5-10 km "dislocated". In eastern Siberia that distance could be 100 km or more.
Soviet military topographic maps are high quality maps. They did even write "tourist guides" of enemy cities with high quality drawings. (If you didnt have a local pilot in ship or "local terrorist" have removed signs.)
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