Water Levels of the Great Lakes

[barry]

On the 30th of September 2020 a repeat of a programme titled Drain the Great Lakes was shown on Television. The programme presented evidence that quite recently, that is since the Great Lakes were sculpted by glacial ice, there has been a period when the water level of the lakes was quite a bit lower than at the current time. The lakes were quite a bit smaller and only connected by rivers; although not Lakes Erie and Ontario, because the water level in Lake Erie was below the level of the Niagara Falls barrier. The lower water level was attributed to climate change, but no attempt was made to explain the climate change except to suggest that greatly reduced rainfall must have been experienced for quite some time.
There is, however, another possibility. It could be that when the Great Lakes were closer to the North Pole, as they would have had to have been if, as suggested in earlier postings, the Phoenicians had visited the lakes and mined copper on Isle Royale and elsewhere around Lake Superior, the water table of the whole region would have been lower. Centrifugal force created by the rotation of Earth raises the sea level at the equator which means that the closer you get to the poles the lower the sea level is. If the North Pole was located close to the South East of Greenland as suggested by this analysis of the situation, drainage of central Canada, the current source of the Great Lakes water supply, could have been redirected into the Hudson Bay. With the North Pole that close the sea level of Hudson Bay would have been well below the current level and it is possible that the whole of North Eastern Canada had a much reduced water table.
The television programme told of a possibly successful underwater investigation for evidence of people having built hunting traps on a drowned ridge crossing one of the lakes, but did not say anything about any other Great Lakes underwater archaeological investigations. Is it possible that underwater exploration around Isle Royale could reveal drowned copper mine workings?

Peter