Thor Heyerdahl investigates the possibility of ancient maritime contact between the Sumerian civilization and other early cultures by attempting to replicate their reed-vessel technology. Heyerdahl, a renowned explorer and ethnographer, utilizes experimental archaeology to test his hypothesis that reed boats were capable of long-distance oceanic travel 5,000 years ago. By assembling an international crew and navigating the Tigris River into the Indian Ocean, he documents the practical realities of ancient seafaring while confronting modern geopolitical obstacles. The narrative serves as both a scientific log and a personal account of the logistical and political challenges inherent in such a high-stakes expedition.

The work is regarded as a significant contribution to the field of experimental archaeology, offering a unique blend of historical speculation and practical field testing. The text provides a dense, firsthand account of the challenges faced by researchers attempting to bridge the gap between ancient theory and modern reality.