Swedish Coast, March 1948 - Incident Number: 150March 1948

I regret that I cannot write a reliable summary of this case. The OCR quality of the document is too poor to extract accurate details with confidence.

What I can discern is that Incident 150 involved a sighting near the Swedish coast in March 1948, where a pilot flying from Aalborg, Denmark to Oslo, Norway reported seeing a projectile pass along the Swedish coast and disappear over Norway. The object was described as traveling at approximately 20,000 feet, emitting a bluish-green glow, leaving no trail, and disappearing over the horizon in four seconds. The file notes that similar objects had been observed at Hjucken, Norway, and mentions that heavy welding was being produced in that area.

However, the OCR rendering is so heavily degraded across multiple pages that I cannot reliably extract additional witness details, analysis, or the Air Force's official evaluation beyond what appears in the index on page 6, which lists this incident among cases categorized by Dr. Hynek as "balloons or ordinary aircraft." Rather than risk misrepresenting the case through guesswork, I defer to the full case file itself.

The full case file is reproduced below as held by the National Archives, consisting of 6 pages of microfilm T1206, Roll 2.