How do you test how people reached Okinawa more than 30,000 years ago? Build a log boat using only Paleolithic stone tools, then paddle it from Taiwan to the Ryukyu Islands. This week, we talk to Prof. Yousuke Kaifu about the extraordinary project he led to explore how prehistoric people could have made a voyage that, even today, seems improbable. It’s a fascinating discussion about their trials-and-errors to build a boat that could handle the open ocean and their journey to cross one of the world’s biggest ocean currents. **Please do not forget to rate and review the show** Have a question or comment? Email: hello@worldsbeforedesign.com Reddit: https://www.reddit.com/r/BeforeUsMedia/ Or click “Send us a message!” at the top of this page. Key People and Projects Yousuke Kaifu Holistic Reenactment Project Website The University Museum, The University of Tokyo Key Places Taiwan Yonaguni Island Ryukyu Island Chain Kuroshio Current Further Reading Chang, Y.L.K., Miyazawa, Y., Guo, X., Varlamov, S., Yang, H. and Kaifu, Y., 2025. Traversing the Kuroshio: Paleolithic migration across one of the world’s strongest ocean currents. Science Advances, 11(26), p.eadv5508. Kaifu, Y., Lin, C.H., Ikeya, N., Yamada, M., Iwase, A., Chang, Y.L.K., Uchida, M., Hara, K., Amemiya, K., Sung, Y. and Suzuki, K. (2025) ‘Paleolithic seafaring in East Asia: An experimental test of the dugout canoe hypothesis’, Science Advances, 11(26), article eadv5507. Kaifu, Y. (2022) ‘A synthetic model of Palaeolithic seafaring in the Ryukyu Islands, southwestern Japan’, World Archaeology, 54(2), pp. 187–206. Kaifu, Y., Ishikawa, J., Muramatsu, M., Kokubugata, G. and Goto, A. (2022) ‘Establishing the efficacy of reed-bundle rafts in the paleolithic colonization of the Ryukyu Islands’, The Journal of Island and Coastal Archaeology, 17(4), pp. 571–584. Kaifu, Y., Kuo, T.H., Kubota, Y. and Jan, S. (2020) ‘Palaeolithic voyage for invisible islands beyond the horizon’, Scientific Reports, 10(1), article 19785. Kaifu, Y., Lin, C.H., Goto, A., Ikeya, N., Yamada, M., Chiang, W.C., Fujita, M. et al. (2019) ‘Palaeolithic seafaring in East Asia: testing the bamboo raft hypothesis’, Antiquity, 93(372), pp. 1424–1441. Kaifu, Y. and Fujita, M. (2012) ‘Fossil record of early modern humans in East Asia’, Quaternary International, 248, pp. 2–11. Video Documentary Don’t forget to also check out the video documentary of their journey: CLICK HERE. Click here to send us a message! Before Us is produced by Worlds Before LLC. Erich Fisher writes and produces each episode and handles sound design and editing. Helen Farr co-hosts and contributes with writing and producing. Ian Laurence composed the theme song. The voices of our hosts and guests are real and have not been generated by AI.