Episode Details

Polynesian navigators crossed and settled a Pacific larger than Russia and North America combined without compass, chart, or instrument. The expansion traces to Austronesian speakers from near Taiwan and the Lapita culture, whose stamped pottery spread 6,000 kilometers east to Tonga and Samoa between about 1300 and 900 BC before vanishing on clay free atolls. Navigation knowledge was a guarded, chanted inheritance. Navigators memorized up to 150 stars rising and setting in fixed houses of a mental star compass, sailed down the latitude using zenith stars, felt refracted ocean swells through the hull, followed terns and golden plovers, released frigate birds, and read green lagoon light on cloud bottoms. In storms they kept running dead reckoning in their heads.

Their reach was vast. Oral history tells of Ui-te-Rangiora sailing near sea ice around 650 AD, and the sweet potato, native to the Americas, was grown in the Cook Islands by about 1000 CE. When James Cook's crew met Tupaia, who charted 130 islands from memory, Europeans treated him as a curiosity, and Andrew Sharp later argued the Pacific was settled by accidental drift. The Polynesian Voyaging Society's Hokulea answered that, and in 1980 Nainoa Thompson, trained by Micronesian master Mau Piailug, navigated it to Tahiti and back without instruments.

• Oral tradition pictures the voyaging routes as an octopus with its head at Raiatea.
• Pre-Columbian chicken bones from El Arenal in Chile sparked a DNA dispute over Polynesian contact.
• Chile's Mapuche used Polynesian style clubs, earth ovens, sewn plank canoes, and the word toki for stone axe.
• Te lapa, flashing underwater light pointing toward islands, still lacks a scientific explanation.
• Surfer Eddie Aikau was lost paddling for help after the Hokulea capsized in 1978.