Mining operations end on Michigan's Upper Peninsula. The water fills this small glacier-created valley and the structures are inundated and thereby protected. Local Indians regard this area as off limits and sacred. Top 900 A.D. Copper again becomes the coin of the realm, this time in Middle and South America. Mayan miners, astronomer-priests remembering the ancient lore of the copper deposits mined centuries earlier in Northern Michigan, mount expeditions to establish control of the mineral for the copper based economy.
Early settlers arrive in the Rock Lake area and see strange protrusions sticking out of the water.
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.