Japanese warning signs are very different than warning signs in other parts of the world, because they usually contain a visual and easy to understand reason why something is dangerous or not allowed.
pictures of most nuclear and thermonuclear atmospheric(or surface) explosions conducted in the period between 1945-1963. On August 5, 1963 limited test ban treaty signed, so all the consequent tests were underground, although there were some exceptions, e.g. China conducted atmospheric tests later. Pictures are grouped by operation names, dimensions and file size shown, almost all of the pictures are color except the ones marked as "bw".