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Beneath the Champ-de-Mars, near the Eiffel Tower, lies a secret military telegraph station from 1909. This underground facility played a crucial role in World War I, aiding France's victory by intercepting enemy communications. Initially intended for demolition, Gustave Eiffel transformed the tower into a vital military asset. The station's strategic importance was highlighted during the war, particularly in September 1914, when it provided critical intelligence on German troop movements. After the war, the station's function evolved, and today it houses administrative offices and kitchens, remaining off-limits to the public. Despite its historical significance, some details about its construction remain unclear, but the Eiffel Tower continues to serve as a massive transmission antenna.