The Younger Dryas Impact: The Comet That Ended the Ice Age?

At dozens of places across North America there is a thin black line in the ground. Under it lie the bones of mammoths and the spear points of the people who hunted them. Above it they never come back. The line marks a moment about 12,800 years ago, when the north fell back into the cold of the Ice Age within a few decades. So what happened, and who was there when it did? This documentary follows the argument over that cold, the Younger Dryas. In 2007 a team of scientists said objects from space exploded over North America. In 2023 thirteen scientists said the idea "should be rejected"; the cold is widely put down to a flood of meltwater from a vast lake. Each side is heard in its own words, Graham Hancock's among them. Beside them stand the Anzick child, buried under red tools in Montana at almost that moment, and J Harlen Bretz, the geologist who waited more than forty years for his telegram. What we know: within a few decades the north went cold again, and the cold lasted more than a thousand years. The mammoths of North America did not outlast it, nor did the Clovis hunters' fluted spear points. The crater under the Greenland ice is real, and a team dated it to almost exactly fifty-eight million years. What nobody knows: what set off the cold. The comet's champions point to tiny spheres, melted glass and soot in a layer they date on four continents, but no crater of the right age has been found. The meltwater side has its lake and a great flood into the Arctic, but in 2026 a team of climate scientists still called it controversial that one flood alone could make a thousand years of cold. Chapters 0:00 Introduction 2:10 1. The child under the red tools 6:40 2. The hunters 10:36 3. The cold that came back 14:39 4. The line in the ground 18:45 5. Something from space 22:56 6. The teams that went back 27:26 7. The man nobody believed 32:06 8. The lake and the conveyor 37:11 9. The village under the lake 42:20 10. The Vulture Stone 46:58 11. The lost civilisation 52:12 12. The crater under the ice 56:14 13. The argument that will not end 1:01:44 Who was there Sources Firestone and others (PNAS 2007); Kennett and others (PNAS 2009, 2015; PLOS One 2025, retracted 2026); Bunch and others (PNAS 2012; Scientific Reports 2021, retracted 2025); Wittke and others (PNAS 2013); Wolbach and others (Journal of Geology 2018); Moore and others (Scientific Reports 2020, corrected 2025); Powell (Science Progress 2022); Sweatman and Tsikritsis (Mediterranean Archaeology and Archaeometry 2017) and the replies; Sweatman (Athens Journal of History 2020); Sweatman, Powell, West and Young (Airbursts and Cratering Impacts 2024). Holliday and others (Earth-Science Reviews 2023, accepted manuscript) and their reply; Surovell and others (PNAS 2009); Daulton and others (PNAS 2010); Buchanan and others (PNAS 2008); Meltzer and others (PNAS 2014); Boslough and others (2012); Haynes (PNAS 2008, and with others 2010); Faith and Surovell (PNAS 2009); Broughton and Weitzel (Nature Communications 2018); Waters and others (Science Advances 2020); Chatters and others (Science Advances 2024). Rasmussen and others (Nature 2014); Becerra-Valdivia and others (PNAS 2018); Alley and others (1993) and the GISP2 record; Cheng and others (PNAS 2020); Carlson and others (PNAS 2007); Broecker (GSA Today 1999); Keigwin and others (Nature Geoscience 2018); Reinig and others (Nature 2021); Science Advances (2026, two papers); Balbas and others (Geology 2017); Kjær and others (Science Advances 2018); Kenny and others (Science Advances 2022). Graham Hancock's website; the Joe Rogan Experience #961 and #2136; Mark Boslough's blog; the German Archaeological Institute; EARTH Magazine; the Yellowstone Gateway Museum; the National Park Service; NASA; HistoryLink; the University of Chicago Magazine; Columbia University. News: AAAS, Aarhus University, Billings Gazette, Eos, Free Malaysia Today, History News Network, Hyperallergic, Live Science, National Geographic, NBC News, NPR, ScienceDaily, Science News, The Scientist, UC Santa Barbara, University of Alberta, Universe Today, Vice. Wikipedia on the Younger Dryas and the film's people, places and animals. The podcast quotations are from the transcripts at fight.fudgie.org. Images Every picture is credited in the pinned comment, the ones under a Creative Commons licence with their links. The maps and drawn cards were made for this film, some maps on Natural Earth data (public domain), the rest over relief maps credited there. No person is drawn, and the Anzick child's remains are never shown. No generated imagery. The narration is a synthetic voice. Music: "Fallen (Asper)" by Eugenio Mininni (Mixkit). Sound effects: Mixkit. Mostly Unexplained: strange stories for a dark evening. True mysteries nobody has solved, told from the original sources. We give the record and the other theories a fair hearing, then say what nobody knows yet. Instagram and TikTok: @mostlyunexplained #YoungerDryas #IceAge #Documentary