One of them is the K-27, once known as the "golden fish" because of its high cost. The 360ft-long (118m) attack submarine (a submarine designed to hunt other submarines) was plagued with problems since its 1962 launch with its experimental liquid-metal-cooled reactors, one of which ruptured six years later and exposed nine sailors to fatal doses of radiation. In 1981 and 1982, the navy filled the reactor with asphalt and scuttled it east of Novaya Zemlya island in a mere 108ft (33m) of water. A tugboat had to ram the bow after a hole blown in the ballast tanks only sank the aft end.

The K-27 was sunk after some safety measures were installed that should keep the wreck safe until 2032. But another incident is more alarming. The K-159, a 350ft (107m) November-class attack submarine, was in service from 1963 to 1989. The K-159 sank with no warning, sending 800kg (1,760lb) of spent uranium fuel to the seafloor beneath busy fishing and shipping lanes just north of Murmansk. Thomas Nilsen, editor of The Barents Observer online newspaper, describes the submarines as a "Chernobyl in slow motion on the seabed".

While the vast size of the oceans quickly dilutes radiation, even very small levels can become concentrated in animals at the top of the food chain through "bioaccumulation" – and then be ingested by humans. But economic consequences for the Barents Sea fishing industry, which provides the vast majority of cod and haddock at British fish and chip shops, "may perhaps be worse than the environmental consequences", says Hilde Elise Heldal, a scientist at Norway's Institute of Marine Research.

But an accident while raising the submarine, on the other hand, could suddenly jar the reactor, potentially mixing fuel elements and starting an uncontrolled chain reaction and explosion. That could boost radiation levels in fish 1,000 times normal or, if it occurred on the surface, irradiate terrestrial animals and humans, another Norwegian study found.

Russia's 'slow-motion Chernobyl' at sea  https://www.bbc.com/future/article/20200901-the-radioactive-risk-of-sunken-nuclear-soviet-submarines, By Alec Luhn, 2nd September 2020

Beneath some of the world's busiest fisheries, radioactive submarines from the Soviet era lie disintegrating on the seafloor. Decades later, Russia is preparing to retrieve them.

By tradition, Russians always bring an odd number of flowers to a living person and an even number to a grave or memorial. But every other day, 83-year-old Raisa Lappa places three roses or gladiolas by the plaque to her son Sergei in their hometown Rubtsovsk, as if he hadn't gone down with his submarine during an ill-fated towing operation in the Arctic Ocean in 2003.

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Christina MacPherson | October 2, 2021 at 6:02 am | URL: https://wp.me/pAhaJ-oxG
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