The plan was that when a bat was released from an airplane, a bomb would dangle from it via a wire. The bomb’s weight would activate a timed fuse, which would eventually trigger the incendiary. Bat Bombs came in two models: a 0.6-ounce incendiary, which produced a 10-inch flame that burned for 4 minutes, and a 1-ounce model, which produced a 12-inch flame that burned for about 6 minutes. By then the critters, released over Japanese cities, would hopefully have roosted inside attics and other nooks and crannies. In theory, the bats would gnaw through the wire that connected them to their incendiaries before they went off, and thus survive their mission and go on to live happy bat lives.
If not, they would have the gratitude of Uncle Sam and the thanks of a grateful nation for their sacrifice. To deliver the individual Bat Bombs to their target area, the critters were first inducted into hibernation, then tiny incendiaries were affixed to them. Next, they were placed in a special bomb casing that contained 26 stacked trays, each with 40 bats, for a total of 1040 bat incendiaries per bomb. The bombs would be dropped at an altitude of 5000 feet above a Japanese city, then deploy a parachute and break open at 1000 feet, to release the by-now awakened bats to fly off and find roosting places.
1. Fortunately for Japan, the Plan to Torch it With Bat Bombs Was Never Carried Out
Project X-Ray experienced some testing mishaps, most notable of which occurred on March 15, 1943. That day, armed bats were accidentally released at Carlsbad Army Air Field, New Mexico, and they set the place ablaze. The silver lining was that it confirmed that weaponized bats can, indeed, start major fires. More controlled weapons testing at a specially designed “Japanese Village” confirmed that Bat Bombs were, pound for pound, between 11 to 21 times more effective than standard bombs. As the project’s chief chemist noted: “the regular bombs would give probably 167 to 400 fires per bomb load where X-Ray would give 3,625 to 4,748 fires“.
Despite promising test results, the authorities pulled the plug on Project X-Ray in mid-1944, when they were informed that it would not produce a deployable weapon until 1945. That was deemed too slow a pace, and since the Manhattan Project was on track to produce a war-winning bomb by then, X-Ray was canceled after a 2-year life and a $2 million expenditure. To his dying day, Dr. Lytle Adams insisted that his Bat Bombs plan could have won the war, with fewer horrors than atomic bombs. As he put it: “Think of thousands of fires breaking out simultaneously over a circle of forty miles in diameter for every bomb dropped. Japan could have been devastated, yet with small loss of life“.
Where Did We Find This Stuff? Some Sources and Further Reading