Ancient canoe replica recreates a 30,000-year-old voyage
Archaeological evidence suggests that about 30,000 years ago, humans first made a crossing from present-day Taiwan to islands in southern Japan. This journey could have ranged from 138 to about 450 miles and was accomplished without metal tools, maps, or modern boats. While the timeline of when East Asia's earliest modern human populations set sail and where they landed is fairly clear, how they did it has been more difficult to pin down. That's where these replica canoes come in.
A team led by anthropologist Yousuke Kaifu from the University of Tokyo created various simulations, experiments, and replica canoes to recreate how this feat may have been achieved.
'We initiated this project with simple questions: 'How did Paleolithic people arrive at such remote islands as Okinawa?' 'How difficult was their journey?' 'And what tools and strategies did they use?'' Kaifu said in a statement. 'Archaeological evidence such as remains and artifacts can't paint a full picture as the nature of the sea is that it washes such things away. So, we turned to the idea of experimental archaeology, in a similar vein to the Kon-Tiki expedition of 1947 by Norwegian explorer Thor Heyerdahl.'
One of the new studies details the construction and testing of a real boat, which the team successfully used to paddle between islands. The team constructed the 24-foot-long dugout canoe called Sugime in 2019. It was built from one Japanese cedar trunk, and with replicas of 30,000-year-old stone tools.
'A dugout canoe was our last candidate among the possible Paleolithic seagoing crafts for the region. We first hypothesized that Paleolithic people used rafts, but after a series of experiments, we learned that these rafts are too slow to cross the Kuroshio and are not durable enough,' said Kaifu.
The team paddled Sugiume about 140 miles from eastern Taiwan to Yonaguni Island in southern Japan's Ryukyu group, which includes Okinawa. They navigated only by the sun, stars, swells, and their instincts. In total, the team paddled for more than 45 hours across open sea, without a lot of visibility of the island. In the six years since, the team is still unpacking some of the data they collected during the experiment, and are using it to inform or test new models about various aspects of Paleolithic sea crossings.
[ Related: Southeast Asian sailors possibly mastered seafaring before Polynesians. ]
'We now know that these canoes are fast and durable enough to make the crossing, but that's only half the story,' said Kaifu. 'Those male and female pioneers must have all been experienced paddlers with effective strategies and a strong will to explore the unknown.'
However, the team does not think that a return journey towards Taiwan was possible at the time.
'If you have a map and know the flow pattern of the Kuroshio, you can plan a return journey, but such things probably did not take place until much later in history,' explained Kaifu.
The team also used advanced ocean models to simulate hundreds of virtual voyages, in an effort to understand if a journey like the one the modern scientists tried could have been made in different circumstances. These simulations tested several variables, including different starting points, seasons, and paddling strategies under both ancient and modern ocean conditions.
Additionally, one of the new papers used numerical simulations to show how they may have crossed the Kuroshio Current–one of the strongest currents in the world. This simulation showed how boats made using tools of the time, and the right know-how, could have navigated the Kuroshio Current.
'The Kuroshio Current is generally considered dangerous to navigate,' Yu-Lin Chang, a study coauthor and oceanography student from the Japan Agency for Marine-Earth Science and Technology, said in a statement. 'I thought if you entered it, you could only drift aimlessly. But the results of our simulations went far beyond what I had imagined. I'm pleased this work helped illuminate how ocean voyages may have occurred 30,000 years ago.'
These various simulations helped fill in some gaps that a simple one-time experiment could not. They also revealed that launching a vessel from northern Taiwan offered seafarers a better chance of success than from points further south. Additionally, paddling slightly southeast instead of directly towards the destination was essential for compensating against the powerful ocean current.
All in all, these findings suggest that the early modern humans in the area must have had a high level of strategic seafaring knowledge.
'Scientists try to reconstruct the processes of past human migrations, but it is often difficult to examine how challenging they really were. One important message from the whole project was that our Paleolithic ancestors were real challengers. Like us today, they had to undertake strategic challenges to advance,' said Kaifu. 'For example, the ancient Polynesian people had no maps, but they could travel almost the entire Pacific. There are a variety of signs on the ocean to know the right direction, such as visible land masses, heavenly bodies, swells and winds. We learned parts of such techniques ourselves along the way.'
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