How did our Paleolithic ancestors manage ocean crossings without modern tools? A daring experimental archaeology project has offered fresh insight. On June 25, 2025, researchers paddled a replica dugout canoe—crafted with Stone Age tools—across the East China Sea, retracing a route early humans may have used some 30,000 years ago.
Building “Sugime” with Primitive Tools
The canoe, named Sugime (meaning cedar in Japanese), was carved from a Japanese cedar tree felled on Japan’s Noto Peninsula using stone-age axes and adzes—replicas of Paleolithic tools. Measuring around 25 feet (7.5 m), this dugout vessel marked a significant technological leap beyond earlier reed or bamboo rafts that failed to resist the formidable Kuroshio current.
The 140‑Mile Voyage
On a mission to test the feasibility of such early crossings, a crew of four men and one woman set off from Ushibi in eastern Taiwan. Over 45 hours, they paddled—and sometimes drifted—for approximately 140 miles (225 km) to reach Yonaguni Island, battling fatigue and the strength of one of the planet’s strongest ocean currents. With no modern navigation aids, they relied on the sun, stars, and ocean swells, although they were accompanied by two escort vessels for safety.
Why This Matters
The success of Sugime is more than a symbolic feat. It confirms with vivid clarity that early humans, equipped with dugout canoes and seafaring expertise, were capable of purposeful ocean crossings—even over currents as powerful as the Kuroshio. This reinforces archaeological findings of Paleolithic presence in the Ryukyu Islands (including Okinawa), suggesting such migrations were technologically and physically possible.
Experimental Archaeology in Action
This is experimental archaeology at its most dramatic: not theorizing from finds, but re-enacting ancient endeavors under controlled yet authentic conditions. The approach echoes Thor Heyerdahl’s Kon-Tiki expedition of 1947—but is rooted in more rigorous archaeological and paleo-oceanographic evidence. A companion study, using paleo-ocean simulations, confirmed that even 30,000 years ago, the Kuroshio’s strength wouldn’t have barred such voyages—though conditions were unpredictable.
A Tribute to Our Ancestors
University of Tokyo anthropologist Yousuke Kaifu, who led the build and paddling efforts, reflected: “Through the project with many failures, we have learned the difficulties of crossing the ocean, and this experience gave us a deep respect for our Paleolithic ancestors.” The crew’s determination—and occasional wake-up fatigue—offers a glimpse into the endurance and navigational skill required by ancient seafarers who ventured across vast, uncharted waters.
What Lies Ahead
This successful voyage opens avenues for further explorations: testing different canoe designs, sea routes, or even seasonal effects. Each experiment adds layers of realism to our understanding of early maritime migration. It also underscores how much human ingenuity, adaptation, and cultural learning shaped our global spread—centuries before written history.
This project not only brings archaeology to life but also pays tribute to early voyagers whose daring crossings set the stage for human expansion across islands and oceans. By blending scientific rigor with adventurous reenactment, the Sugime expedition connects our present curiosity to humanity’s ancient boldness—and enriches our story of global heritage.
