In the late 19th century, the British Empire wrapped the globe not only in pink on maps but in copper beneath the seas. This vast web of submarine telegraph cables, known as the All Red Line, allowed London to communicate with its far-flung colonies without relying on foreign powers. At a time when information could decide the fate of empires, the All Red Line became one of Britain’s most important and least visible strategic assets.

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All Red Line: The British Empire's Secret Weapon of Communication
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