Field Report: Investigation of Incident at Lake Kölmjärv

This document is a field report detailing an investigation into a suspected projectile impact at Lake Kölmjärv. The investigators, affiliated with the Radlofysiska Institutionen, utilized a portable radiation meter, which was originally designed for checking shielding on X-ray equipment. Due to the device's sensitivity to sunlight, they had to cover its window with black paper during operation. The lake, which runs roughly north-to-south, is approximately 200 meters wide at the site of the alleged impact. The projectile was reported to have arrived from the west at a steep angle, potentially continuing its path after the initial impact. Despite thorough searches of the water and the surrounding forest, no trace of the object was found. The investigators conducted multiple boat trips across the area to survey the site. They observed physical evidence of a disturbance, including broken or torn reeds at the shore and uprooted water lily roots floating near the surface. On the opposite side of the lake, they found detached plant parts, specifically horsetail, which they speculated might be related to the impact. Additionally, the team attempted to use an electric mine detector to locate the object. They held the detector a few centimeters above the water surface while traversing the lake in a rowboat. However, they were unable to distinguish any genuine signals from the background interference, which was particularly prevalent near the shorelines.