Cold War Killers (1986)

While draining a small lake to make room for a new housing development, a crew finds the wreckage of an old missing Cold War-era British Air Force bomber, with the remains of the pilot at the controls. An investigator assigned by British Military Intelligence to find out what happened soon discovers that there's more to the incident than there appears to be, and it involves smuggling, the black market, the Russian KGB, the Nazi SS and a series of murders.