(A long read, large file) The penultimate stage of the flooding is dated 10,000 years ago, but they usually avoid dating of the last, uppermost sea terrace. In which case, the total flooding of Beringia 8,200 years ago is an acceptable assumption. Electrical discharges moving with space velocity liquidate the most part of threat pointwise: the most dangerous meteorites blow up from the bottom side, and most of them do not reach the surface of the planet.