NemoClaw Knowledge Wiki

Cold War's Sunken Nuclear Subs: Environmental Risks, Monitoring, and Salvage

4 min read

Cold War’s Sunken Nuclear Subs: Environmental Risks, Monitoring, and Salvage

Generated: 2026-05-31 · API: Gemini 2.5 Flash · Modes: Summary

Cold War’s Sunken Nuclear Subs: Environmental Risks, Monitoring, and Salvage

Clip title: Salvaging the Cold War’s Sunken Nuclear Subs Author / channel: SciShow URL: https://www.youtube.com/watch?v=2ZK_Gy1uE2A

Summary

There are approximately 150 nuclear submarines operating globally, and a small but significant number of these have been lost at sea. These sunken submarines pose a serious environmental threat due to the nuclear reactors, spent fuel, and potentially nuclear weapons they carry. Accidents, explosions, fires, or even slow saltwater corrosion can breach the vessel’s integrity, releasing radioactive atoms, known as radionuclides, into the ocean. This contamination could have severe long-term consequences for marine ecosystems and human health, as radionuclides can accumulate and magnify through the food chain.

Nations owning these wrecks, such as the United States, Russia, and Norway, actively monitor the sites to assess radiation levels. While current data suggests that leakage from many of these wrecks is relatively low and localized, the long-term stability of the containment is a major concern. Experts fear that further corrosion or seismic events could destabilize the nuclear material, potentially leading to a meltdown if fuel rods become jumbled and overheat. The economic impact can also be substantial; for instance, concerns over contamination after the Fukushima nuclear disaster led to fishing bans, demonstrating how even the perception of radioactivity can devastate local fishing industries.

Efforts to recover or secure these wrecks have varied in success and motivation. The most dramatic recovery attempt was the CIA’s Project Azorian in the 1970s, a covert operation to retrieve the sunken Soviet submarine K-129, primarily for intelligence gathering. This ambitious project used a giant claw device but only managed to recover a portion of the sub, including some nuclear torpedoes, before the rest broke apart and fell back to the seabed. Other cases include the successful retrieval of most of the Russian submarine Kursk using a more robust drilling and gripping technique, and the USS Guitarrro, which sank during construction in shallow waters and was easily refloated.

The remaining wrecks continue to present unique challenges. For example, the K-27 was intentionally sunk with tar in its reactors as a temporary solution, but this fix is only designed to last until 2032. The K-159 is too fragile to be lifted by conventional means, prompting plans for a specialized recovery using barges with curved grippers and a submersible platform. While these recovery missions are technically complex and costly, they are crucial to prevent widespread environmental contamination and to address the persistent liabilities these sunken nuclear vessels represent for current and future generations.

Video Description & Links

Description

This video is supported by Complexly’s partnership with Outrider Foundation, a nonprofit foundation that supports journalism and storytelling about nuclear threats and climate change. Complexly is solely responsible for the content. Learn more at https://outrider.org/

Today, there are multiple nuclear submarines on the bottom of the ocean floor with the potential to leak radioactive material. But how much damage will that cause? Learn about the K-27, K-159, K-278, K-129, Kursk, and Guitarro.

Hosted by: Hank Green (he/him)

Support us for $8/month on Patreon and keep SciShow going! https://www.patreon.com/scishow Or support us directly: https://complexly.com/support Join our SciShow email list to get the latest news and highlights: https://mailchi.mp/scishow/email

Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Shaji John, Timos Gies, Jon Coffman, Anita, Anne Herrington, Ashley Moquin, yeyette, David Johnston, Cye Stoner, Jp Lynch, Bethany Matthews, Chris Curry, J.V. Rosenbalm, Blood Doctor Kelly, Toyas Dhake, Reed Spilmann, Garrett Galloway, Friso, Lyndsay Brown, Jeremy Mattern, Jaap Westera, Matt Curls, Eric Jensen, Chris Mackey, Adam Brainard, Piya Shedden, Steve Gums, Alex Hackman, Kevin Knupp, Chris Peters, Kevin Bealer, Joseph Ruf, Jason A Saslow

Looking for SciShow elsewhere on the internet? SciShow Tangents Podcast: https://scishow-tangents.simplecast.com/ TikTok: https://www.tiktok.com/@scishow Instagram: http://instagram.com/thescishow Facebook: http://www.facebook.com/scishow Bluesky: https://bsky.app/profile/scishow.bsky.social

SciShow science education learning complexly

Sources: https://docs.google.com/document/d/e/2PACX-1vStdDp5B9PqXwWQb4_uGSvgRIxMPpv1-N7Iu9otK-BiNRt1pXpUmjt9UpeK8E7GEjQ0DKgBjgVrMYqh/pub

Tags

SciShow, science, Hank, Green, education, learn, complexly, hank green, nuclear waste, Salvaging the Cold War's Sunken Nuclear Subs, nuclear, nuclear submarines, cold war

URLs

Graph View

Backlinks