00:00What if I told you that an entire city was built in completely secrecy?
00:06This hidden city would help create the world's first atomic bomb.
00:11The Blitz lasted for months. More than 40,000 civilian buildings were destroyed.
00:17Instead of breaking the nation's spirit, the...
00:20Night after night, firefighters risked their lives to stop entire neighborhoods from disappearing.
00:25They often worked with almost no sleep, saving countless homes and historic landmarks.
00:30Some nights were so devastating that the sky glowed red for miles.
00:34Entire streets vanished under bombs. Yet by the sunrise, survivors were already clearing rubble.
00:40Every window had to be covered. Every light had to disappear.
00:44Even a tiny beam could help German bombers find their targets.
00:47London became one of the darkest cities on Earth.
00:50Britain had a secret advantage. Radar.
00:53Long before enemy bombers appeared overhead, radar stations detected them crossing the channel.
00:58This gave RAF pilots precious minutes to...
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