Mysterious bursts of radioactivity are emanating from the Soviet submarine Komsomolets, which sank in the Norwegian Sea in 1989.

A Soviet submarine sank nearly a mile deep in the Norwegian Sea, and thirty-five years later, it still emits bursts of radioactivity that are not fully understood. This is not the plot of a disaster movie, but the reality of the Komsomolets, the secret flagship of the USSR’s Northern Fleet, which was lost in 1989 after a fire. One would expect an old nuclear wreck to pose a constant and massive threat to the ocean. Surprisingly, however, the latest studies reveal that the radioactivity is less concerning than expected—although the presence on board of two intact nuclear weapons remains a sword of Damocles. The story of the Komsomolets is, first and foremost, the story of a technological feat. The USSR wanted a submarine capable of diving deeper than any NATO submarine, thanks to a double titanium hull that would allow it to patrol at a depth of 900 meters, nearly three times the usual depth. This deep-sea monster was also a stealth weapon, powered by enriched uranium, capable of approaching the U.S. coast without ever being detected. But on April 7, 1989, a fire on board shattered this invincibility. Out of sixty-nine crew members, forty-two perished. One detail left a lasting impact on the survivors: the escape chamber, a kind of escape pod, managed to save only five of the six officers trapped inside— a number that still haunts their families. More than three decades later, an international team is studying the wreck using sonars and robots. The result: although radioactivity was detectable around the hull, it did not spread widely in the waters of the Norwegian Sea. Yet the mystery remains: Why do we observe sudden spikes, “bursts” of radioactivity, when everything should be stable? No one can guarantee that the condition of nuclear weapons will not one day upset this fragile balance. What is striking is that, where one might imagine a permanent disaster, nature and technology are engaged in an unlikely—but temporary—balancing act. The real paradox is that the greatest threat is not the gutted reactor, but these two silent warheads, whose future no one can predict. No one talks enough about the courage of the rescue workers or the families of the missing, who are still waiting for a resolution. We expect the nuclear danger to be immediate and visible. But it is the long term, the uncertainty, the possibility of a sudden awakening, that is truly worrisome. The key takeaway? It’s not the accident that’s most frightening; it’s the lingering, silent nuclear threat at the bottom of the ocean. If this kind of story resonates with you, on Lara Notes you can select I'm In — it's not a like; it's a way of saying that this idea now matters to you. And if one day you tell someone the story of this forgotten submarine, you can mark it with Shared Offline — that’s the gesture to indicate that this conversation really mattered to you. This Note is from the article in “Le Temps” and saved you over a minute and a half of reading time.