“Countries like the United States and Russia began nuclear testing in the mid-1940s. France, England, and China jumped on the bomb bandwagon a few years later. And with each detonation, radioactivity levels in our atmosphere increased. That meant each time steelmakers were blowing oxygen into new steel, they were also blowing nuclear particulates into it.  That’s not true for the steel used to fabricate pre-1942 vessels, which is virtually radiation-free. And its clean status makes this metal particularly valuable for some technical applications of nuclear medicine and, more commonly, the development of nuclear energy and weapons.”

Read more: https://www.outsideonline.com/2168646/how-does-entire-shipwreck-disappear-bolts-and-all

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