On the Natural Geographic Channel, Naked Science, episode 15871, Aug.
31’ 08, titled, first to cross the Ocean, dealt primarily with man’s
first migration to Australia. It showed a chart of the ocean sea
levels over the last 100,000 years.

The chart shows a dip in sea level by about -55 meters at 40,000 BP,
with three more dips, progressively lower to about -75 M, then a vary
large drop at 30,000 BP to -140 M that lasted until 20,000BP. At this
point water levels rises steeply, with two short levels at 17,000BP,
-100 M, and 12,000BP, -60M, finally reaching to day’s sea level at
8,000 BP.

The problem is the channel from Siberia to Alaska is only about -50M
deep. This means that man could walk across before 12.000BPand needed
a boat after that, the land bridge would be closed.

This also means that a pet idea I’ve held for a long time won’t work
that the best place to have a village would be on Onimack inland
across from Friday Harbor, and the only high ground, baring a few
islands between Siberia and south to the larger North American
continent.