Local Indians speak of the 'Rock Teepees ' of the 'Ancient Foreigners'. D Local residents establish saw mills and dam up stream and creek water levels rise and totally submerge structures. Two local residents, the Wilson brothers, spot mysterious structures underwater while duck hunting. Unusual clarity exists as it is late fall and rainfall was low for the year dropping water levels below normal. The two men advise the other residents of Lake Mills and dozens of people in boats converge on the lake to witness the underwater structure.
Several boys dive a short distance and touch the pyramidal structure.
It is described as a long tent shaped structure of undetermined height and approximately 100 feet long. The next day water conditions change and the structures are lost to the murkiness and silt of the lake. Top 1900 -1930's Various sightings of pyramid structures by local residents. Also first aerial sighting reported by civilian and military pilots. Local school teacher does first research and hires members of the university swim team to free dive on the structures.