Report regarding investigation of suspected rocket projectile impact in lake

This document is a report from the Royal Sundsvall Anti-Aircraft Corps to the Air Defense Department of the Defense Staff, dated August 14, 1946. It concerns an investigation into a reported suspected rocket projectile impact in a lake. On August 5, 1946, at approximately 17:30, two forest workers, J.H. Näsberg and S. Andersson, were in a boat on Lake Skinnsjön. They reported hearing a 'hissing' sound, which they initially mistook for a car on a nearby road. Immediately afterward, an object impacted the water 75 meters from their position. The witnesses, who were facing the impact site, described the phenomenon as looking like a water spray caused by a stone, with the disturbed water measuring 2 to 3 meters in diameter. The sound was described not as a normal splash, but as an 'explosion,' reminiscent of dynamite detonating underwater. The water spray formed a spiral shape, wider at the surface and narrowing upward to a height of about 2 meters. The lake was otherwise calm. The phenomenon ceased after a few seconds, leaving only water rings with no smoke or steam. The witnesses returned to the site around 20:00, marking the spot with an oar, but observed no debris. The lake at that location has clear water to a depth of 1.5 meters, followed by at least 3 meters of loose mud. The witnesses initially considered the possibility of a waterspout, but rejected this theory because the phenomenon did not move and ceased instantly, leading them to believe another cause was responsible.