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Declassified UFO / UAP Document

Summary of Investigation — Ulriksdal, 5 September 1946

📅 Two days before the measurement (September 3, 1946) 📍 Ulriksdal 📄 Summary report
Sweden1946projectileinvestigationUlriksdal

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AI-Generated Summary

TL;DR

A 1946 investigation into a suspected projectile impact in Ulriksdal failed to locate any debris. Investigators suggest the object may have been a metallic fragment from a larger, high-altitude projectile.

This document, dated September 5, 1946, from Ulriksdal, provides a summary of an investigation into a suspected projectile impact that allegedly occurred two days prior. The investigators, R. Rynninger and T. Wilner, report that they were unable to locate any parts of the projectile during their search. They utilized a small electric mine detector, which proved ineffective. Furthermore, measurements taken to detect radioactivity yielded no evidence of significant radioactive substances, although the authors caution that this does not definitively rule out the presence of radioactive material with a short half-life at the time of the impact. The report posits that if an impact did indeed occur, it is plausible that the object was a fragment of a larger projectile that had traveled at a high altitude without being previously observed. The authors speculate that the object could have been a spent combustion chamber or a fuel container. Given the hypothesis that the object is composed largely of metal, the investigators conclude that a search conducted with a larger, more capable type of projectile detector might be more successful in locating the object.

Om ett nedslag verkligen skett, förefaller det ej otänkbart, att det rört sig om en del av en större projektil,vilken passerat på stor höjd utan att bliva observerad.

Official Assessment

The investigators suggest that if an impact occurred, it may have been a part of a larger projectile that passed at high altitude without being observed, such as a spent combustion chamber or fuel container.

Initial searches with a small electric mine detector were unsuccessful. Radioactivity measurements were negative for significant amounts of radioactive material, though the authors note this does not rule out a projectile with a short half-life.

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