Earthquakes, tsunamis, hurricanes: that's what most of us picture. But some of the deadliest disasters in history began with something people built. This episode counts down ten of them: the deadliest man-made disasters where the public record shows a document, a permit, an inspection or a decision that let the dam, the ship or the plant keep running.

Chernobyl isn't on the list: by 2005, the U.N. agencies that reviewed it reported fewer than 50 deaths directly attributed to its radiation, while the projections run from 4,000 to far higher. The ranking uses the latest official count wherever one exists (for the Doña Paz, the Philippine Supreme Court's figures); the missing and the higher estimates are given beside each number. Attacks and acts of war are excluded.

From the Toya Maru, 1954, to the Banqiao Dam, 1975: the Titanic, Halifax, Le Joola, Vajont, Johnstown, the Doña Paz, Derna and Bhopal, with how the public reacted at the time. Every claim is sourced to a public document and each conclusion is attributed to the body that reached it. In Derna, the retrial had reached no verdict as of September 2026. No images of victims are shown.

CHAPTERS
0:00 The countdown
0:36 Why Chernobyl isn't on the list
1:32 Deepwater Horizon and Fukushima
2:09 10. Toya Maru, 1954
4:36 9. Titanic, 1912
6:52 8. Halifax, 1917
8:39 7. Le Joola, 2002
11:01 6. Vajont Dam, 1963
13:42 5. Johnstown, 1889
15:42 4. Doña Paz, 1987
17:44 3. Derna, 2023
20:36 2. Bhopal, 1984
23:38 1. Banqiao Dam, 1975
26:18 The final ranking

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SOURCES
Banqiao: Yi Si, in Dai Qing (ed.), The River Dragon Has Come!, 1998; Human Rights Watch, The Three Gorges Dam in China, 1995
Bhopal: Supreme Court of India, order of March 14, 2023; Amnesty International, Clouds of Injustice, 2004; The New York Times, January 28, 1985
Derna: Human Rights Watch, December 6, 2023; World Meteorological Organization; Libya Herald, 2024; The Libya Observer, 2025
Doña Paz: Supreme Court of the Philippines, G.R. No. 131166 (1999) and G.R. No. 160219 (2008)
Johnstown: Transactions of the ASCE, 1891; National Park Service
Vajont: Corte di Cassazione, March 25, 1971; Italian Civil Protection Department
Joola: Commission d'enquête technique, Dakar, 2002; European Court of Human Rights, 2022
Halifax: Wreck Commissioner's Inquiry, 1918; Nova Scotia Archives
Titanic: British Wreck Commissioner's report, 1912; U.S. Senate Report No. 806, 1912
Toya Maru: Japan Marine Accidents Inquiry Agency, ruling of 1959
Chernobyl: Chernobyl Forum, 2006; WHO, 2005; IARC, 2006; TORCH, 2006; Greenpeace, 2006; Yablokov et al., 2009
Deepwater Horizon: National Commission, Deep Water, 2011. Fukushima: Reconstruction Agency of Japan, 2026

IMAGE AND SOUND CREDITS
Footage: U.S. Coast Guard; U.S. Army / AFN Vicenza via DVIDS (the appearance of DoD visual information does not imply or constitute DoD endorsement); U.S. National Archives (Universal Newsreel); Nova Scotia Archives (film by W.G. MacLaughlan); Ministry of Defense, Japan; CC BY: Carl Willis, AndyGreenT, Alain Devalpo, International Crisis Group, Max Alex (PLATOON72), EMERCOM of Russia. Photos and documents: Library of Congress; Library and Archives Canada (W.G. MacLaughlan, CC BY 2.0); Nova Scotia Archives; U.S. National Archives; NOAA; NASA Earth Observatory; USGS; Copernicus Sentinel-2 (EU); Gallica-BnF (Agence Rol); Asahi Shimbun; National Park Service; Victoria Daily Times, The Halifax Herald, The Pittsburg Dispatch (public domain). Source: Tokyo Electric Power Company Holdings. CC BY-SA 2.0: Clay Gilliland, lindsaybridge, David Brossard, Martin Stott / Bhopal Medical Appeal, Luca Frediani. CC BY-SA 3.0: Yaamboo, Julian Nyča, DigitalGlobe. CC BY-SA 4.0: VENET01, Thilo Parg, Davide Mauro, David290, Patrick Roque, Im Fokus, Z22, Jordi Ferrer-Beltran, 掬茶. CC BY 4.0: Ahmed Khalil. RECONSTRUCTION marks generated images and clips, never real footage or real identifiable people. Music: Kevin MacLeod (incompetech.com), "Mirage", "Man Down", "On the Passing of Time", "Spacial Harvest", "Controlled Chaos", "Reawakening", "Promises to Keep", licensed under Creative Commons: By Attribution 4.0 License, http://creativecommons.org/licenses/by/4.0/; DesiFreeMusic (Pixabay). Effects: Pixabay, Mixkit, Freesound (CC0).

No AI presenter, no synthetic persona. Narration is synthesized. Where the sources disagree or leave a point unconfirmed, the narration says so.