Or, closer to home (my home at least)...<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;1950_British_Columbia_B-36_crash" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;1950_British_Columbia_B-36_cra...</a><p>There is some debate as to how many years any bomb parts, including the important bits, may have sat open and unguarded on Canadian soil.  There is even the possibility that the core still lies somewhere nearby as we have no definitive answer as to its recovery.<p>[Cores at this time were transported separate from the bomb.  Arming involved manually inserting the core while in flight.  It could be anywhere, even thrown into the sea.]