Investigation Summary
The incident began on June 13, 1952, when a Swedish Tp 79 (serial 79001) nicknamed 'Hugin' was conducting SIGINT operations to monitor Soviet military installations and naval exercises. The aircraft was equipped with British surveillance gear and was secretly cooperating with NATO interests, despite Sweden's official neutrality. At 11:23 CET, a navigator's radio call was abruptly interrupted. A subsequent search involving two Tp 47 Catalina flying boats led to the second shootdown on June 16. The Catalina (serial 47002) was attacked by two Soviet MiG-15s north-west of Dago. The pilot managed to ditch the aircraft near the West German freighter Munsterland, and all seven crew members were rescued before the aircraft sank. For nearly 40 years, the Swedish government maintained the DC-3 was on a routine navigation training flight to protect the secrecy of its intelligence cooperation with the West. It was only after the collapse of the Soviet Union that Russian authorities admitted the shootdowns were ordered by Soviet command.
Final Conclusions
A 2007 technical investigation of the salvaged DC-3 wreckage confirmed it was shot down by a MiG-15bis using 23 mm and 37 mm grenades. The investigation found that at least one explosive grenade struck the left engine oil tank, causing a massive fire. The aircraft likely attempted an emergency sea landing but struck the water at high speed, possibly due to low visibility or landing gear deployment issues caused by hydraulic damage. The clock in the cockpit stopped at 11:28:40 CET. While search results sometimes vary on the count of remains found, the official investigation confirmed the remains of four crew members were identified following the 2004 salvage operation.
Photographic Evidence (1)
Video Analysis
The Catalina Affair - Swedish Aircraft Shot Down in the Cold War — A detailed look at the 1952 shootdown of a Swedish DC-3 and the subsequent search-and-rescue Catalina that was also downed by Soviet forces.
If playback is blocked, the owner has disabled embedding — use the link above.
Airframe & Maintenance
Swedish Air Force Hugin — Douglas Tp 79 (C-47-DL) · 79001
Systems & Failure Modes
SIGINT Equipment
The DC-3 was outfitted with British-made electronic intelligence gathering tools to monitor Soviet radar and communications.
MiG-15bis Armament
The Soviet interceptors used a combination of 23 mm and 37 mm cannons to down the Swedish aircraft.
Interesting Facts
- 01The DC-3 was carrying five civilian SIGINT operators from the FRA and three military crew members.
- 02A life raft recovered shortly after the disappearance contained shrapnel from Soviet 23 mm cannon rounds.
- 03The DC-3 wreckage was discovered at a depth of 126 meters (413 feet) by Anders Jallai and Carl Douglas.
- 04The Swedish government officially admitted the SIGINT nature of the mission only after decades of public pressure and the end of the Cold War.
- 05The salvaged DC-3 is currently on permanent display at the Swedish Air Force Museum in Linköping.
- 06The DC-3 (79001) was originally a USAAF C-47 that saw action in North Africa before being sold to Sweden.
Safety Actions & Advisories
Intelligence Disclosure
Following the recovery of the aircraft, the Swedish government declassified documents regarding the extent of their Cold War intelligence cooperation with NATO.
Known Controversies & Unanswered Questions
Swedish Government Secrecy
Reference ↗For nearly 40 years, the Swedish government officially claimed the DC-3 was on a navigation training flight, despite knowing it had been shot down while spying for NATO.