On the night of February 24, 1942, war nerves in Southern California were stretched past the breaking point. Just one day earlier, a Japanese submarine had shelled an oil facility near Santa Barbara. So when military intelligence warned of an imminent attack, Los Angeles braced for impact.
At 2:25 AM on February 25, air raid sirens wailed across the county, plunging millions into a mandatory blackout. Searchlight beams crisscrossed the dark sky, eventually locking onto an unidentified floating object above Santa Monica. Believing a wave of enemy bombers was overhead, the 37th Coast Artillery Brigade unleashed absolute chaos.
Over the next hour and a half, anti-aircraft batteries fired 1,440 heavy anti-aircraft shells and thousands of machine-gun rounds at the slow-moving shape. Shrapnel rained down across suburban neighborhoods, damaging dozens of buildings and vehicles, while heart attacks and traffic accidents during the blackout tragically claimed five civilian lives. Yet, despite the apocalyptic barrage, no bombs were dropped, and no enemy aircraft ever crashed.
Secretary of the Navy Frank Knox later dismissed the entire spectacle as a false alarm sparked by war nerves, though conspiracy theories immediately bloomed, ranging from cover-ups of Japanese spy planes to extraterrestrial craft. Decades later, historical analysis by the U. S.
Air Force concluded that the phantom target was almost certainly a lost meteorological research balloon released shortly before the chaos began. The stray balloon had drifted serenely through the searchlights, catching glints of light that jittery artillery crews mistook for an invading armada.