This engrossing documentary chronicles a less familiar part of Asian history. After the resignation of Nixon, the armies of the communist North advance southward like a tidal wave. Thousands of lives are in peril: the Americans and the Vietnamese who fought alongside them. The last minute "exodus" by land and sea, including hordes keen for a free ticket to the "promised land", is depicted in detail. It is a picture of tragedy and grandeur, as two populations, same in language, race and culture, separated only by different schools of political indoctrination, come into bloody conflict. War perhaps is part of our ancestral genes, inciting awe and adrenalin rush, sooner than pity.