Transair DC-3 crew see a metallic disc over Hassleholm
On 17 December 1953 a Transair DC-3 flying at about 2,150 m over Hassleholm in southern Sweden was passed by a "shining metal spherical elliptical object" about 600 m below, just above the clouds, heading southwest at about the speed of sound for 6 to 7 seconds, with no exhaust or contrail. The witnesses were chief pilot Capt Ulf Christiernsson and crew chief Olle Johansson; the captain called it "something absolutely new, possibly an unmanned robot". The Swedish Defence Staff said it "could not have been any Swedish aircraft" and opened an investigation. The US attache report rests on translated press and an Air Board source who doubted the pilot.
How plausible · High
Two named airline crew describe a metallic disc at near-sonic speed, and Sweden's Defence Staff ruled out its own aircraft; the attache report is secondhand and carries one hostile source.
- ●●Access Crew saw it 600 m below their aircraft.
- ●●No gain sought Nothing sold.
- ●●Checkable details check out DOW-UAP-D163 is released.
- ●○Cost of speaking Named publicly and attacked by an Air Board source.
- ●○Consistent over time Captain and crew chief agree.
- ●○Restraint Calls it "possibly" a robot.
Plausibility weighs how well an account fits where secrecy hides the documents by design, so missing records never count against it. Strength measures what is documented. Assessed 2026-10-24.
On the record
- IR-12-54 (US Air Attache, Stockholm), secondhand: translated press plus an Air Board source.
- Object narrow from the side, nearly round from below (a disc seen edge-on); no cylinder wording.
- Gen. Nordenskiold: "could not have been any Swedish aircraft".
- Swedish Defence Staff opened an investigation.