The end of the second world war, with the American troops in the Pacific Ocean constantly westward, front approaching Japan, monster energy hats Japan maintain the war has gradually show ambition. To be on the east coast of the United States, at the Japanese have been hoping to implement a direct hit, but because the fleet carriers strength has not as good as before, long-range bombers and can't complete, Japan can only overlook the ocean, born and resentment.

To hit the U.S. mainland, Japan decided to start a bold plan, that is equipped with an explosive device manufacturing balloon landmarks, and attack the United States. The remote balloon bombs idea actually not fresh, as early as in 1942, Japanese researchers have found that winter in the Pacific about 9150 m high, there is a share of the east strong airflow, can let carry explosives in a balloon within 3 days every now and then 9000 km, arrived in the continental United States. At that time the Japanese strength is strong, failed to pay attention to. Now at an end of the Japanese troops decided to carry out the plan.

Idea looks very tempting, but also very difficult technical problems. During the day the sun in a balloon expands will rise, cheap ray bans and in the darkness of the night and cold shrink down, so that it will be difficult to guarantee in the height of the relatively fixed on a particular air flight. Finally, the technical personnel to develop a set of control institution to solve this problem, the agencies subject by a pressure altimeter, control institutions plus some of the goods as pressure sandbags to form. If the balloon height below 9000 m, the agency will automatically start explosive bolt, throwing aluminum round shape frame hanging around the ballast sandbags, the balloon will rise. In order to ensure a balance wheel form, every time also put on the symmetry position of two more sandbags. If the balloon over 11600 m high, radio altimeter will start hydrogen release valve, so the balloon will fall.

The first Japanese used rubber coating silk manufacturing balloons, then switch to better NuoMiZhi layers. The balloon about 10 meters in diameter, can hold 540 cubic meters when filled with hydrogen, can will 90 kilograms of load to 11000 meters high. The balloon nacelles through 19 root sling with sphere connected, the pod is equipped with air pressure altimeter, release mechanism, fuze device, 32 ballast sandbags, 2 pieces incendiary and about 15 kg anti-personnel killer play. On the ball with suicide bombs. After nearly 70 hours, if no accident, the balloon will arrive in North America, the agency will start time and in turn on the incendiary device, then kill the personnel will cast, drop the bomb at the same time, timing agencies will also lit up a root 19.5 meters long slow burning fuse, fake Ray Bans Rare Prints 82 minutes, blasting fuse is a small bomb, the entire balloon. This organization is a small battery power, through the slow fuze start explosion institutions. Each balloon balloon will need to 600 only a NuoMiZhi joining together make, plus full control agencies, cost about $900, which is a relatively expensive equipment. In order to make this unprecedented secret weapon, the Japanese use a lot of manpower material resources, many cinemas were removed to seat, become a temporary balloon manufacturing plants, some large sumo museum is also used to manufacture the balloon or raw material storage. A lot of women and students were mobilized, join to making the balloon bombs in the team.