The WWII Shadow Alarm That Outsmarted Intruders — No Wires, No Power, Just Light!
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The WWII Shadow Alarm That Outsmarted Intruders — No Wires, No Power, Just Light!
Before motion sensors, before electricity — there was the secret WWII Shadow Alarm. In this episode of Warfield Survival, we uncover the forgotten wartime security device that used nothing but candlelight and geometry to detect intruders inside bunkers and tunnels. No wires. No circuits. Just light, shadow, and soldier ingenuity. In this deep ...
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