A focal point of Colony Earth's plot is the comet destruction and subsequent flooding, which destroyed Neolithic seaports. For verification, see for example http://www.youtube.com/watch?v=wPWQ-Ax0o84

Underworld - Flooded Kingdoms Of The Ice Age (part one)

Graham Hancock's mind bending series on underwater civilisations, lost to humanity after being buried by the great floods at the end of the Ice Age. Are the ...