During the dramatic events of WWII the US was facing a major confrontation with Japan. A tough fight for the latter. Pearl Harbor kamikaze attacks alone speak about the futility of Japanese effort. Terrified that US airplanes could easily fly over their cities and bombard them, Japan devised a secret plan to retaliate.
The sightings of strange air balloons over the United States began in 1944. Some of their remnants were occasionally found and studied until one was captured and tied to a stake by a sheriff. The object appeared to be a paper balloon with attached bomb. The US recognizance later found out that these balloons were being sent from over the ocean.
Japanese launched a project on sending self-portable balloon bombs. The first weapon to strike between continents. Explosives were traveling from Japan to the US in jet streams, fitted with altitude meters through the course of development. The air flow cooled down the balloon and it descended into waters failing to reach destination. Later they were fitted with sandbags for weighs, released when the altimeter readings dropped, to get back into the air current. Providence of sand was the main clue about the source of attacks. This is how the search was geographically narrowed down to Japan as we know by now. Continue reading