Built at Great Expense on the Kent Coast in the 1930s, the Longest Listening Wall Ever Built Was Left in the Wind After a Discovery that No One Could See

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On one side, engineers who rely everything on reinforced concrete and raw power to protect one territory. On the other, a handful of invisible radio waves, almost immaterial, which will sweep everything in a few months. This opposition alone sums up the unknown history of British acoustic mirrors, these giant parabolic walls erected on the [...]