{"id":627607,"date":"2026-01-19T00:42:12","date_gmt":"2026-01-18T23:42:12","guid":{"rendered":"https:\/\/cronologia-universale.it\/1993-14\/"},"modified":"2026-01-19T00:42:12","modified_gmt":"2026-01-18T23:42:12","slug":"1984-2004","status":"publish","type":"post","link":"https:\/\/cronologia-universale.it\/en\/1984-2004\/","title":{"rendered":"1984 &#8211; 2004"},"content":{"rendered":"<p>The US Navy uses ELF (Extremely Low Frequency) standing waves to penetrate deep into the oceans, maintaining radio contact with nuclear submarines even without surfacing. To do this, it operates stations at Clam Lake, Wisconsin, and Republic, Michigan, with 28-mile-long (46 km) underground antennas. The first to study standing electromagnetic waves was probably Nikola Tesla, a century earlier, in Colorado.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The US Navy uses ELF (Extremely Low Frequency) standing waves to penetrate deep into the&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[29],"tags":[],"class_list":["post-627607","post","type-post","status-publish","format-standard","hentry","category-as-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>1984 - 2004 - Cronologia Universale<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cronologia-universale.it\/en\/1984-2004\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"1984 - 2004 - Cronologia Universale\" \/>\n<meta property=\"og:description\" content=\"The US Navy uses ELF (Extremely Low Frequency) standing waves to penetrate deep into the...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/cronologia-universale.it\/en\/1984-2004\/\" \/>\n<meta property=\"og:site_name\" content=\"Cronologia Universale\" \/>\n<meta property=\"article:published_time\" content=\"2026-01-18T23:42:12+00:00\" \/>\n<meta name=\"author\" content=\"Rick\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Rick\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/cronologia-universale.it\/en\/1984-2004\/\",\"url\":\"https:\/\/cronologia-universale.it\/en\/1984-2004\/\",\"name\":\"1984 - 2004 - Cronologia Universale\",\"isPartOf\":{\"@id\":\"https:\/\/cronologia-universale.it\/#website\"},\"datePublished\":\"2026-01-18T23:42:12+00:00\",\"author\":{\"@id\":\"https:\/\/cronologia-universale.it\/#\/schema\/person\/f510f53010edc7a70b16caecf1c4af03\"},\"breadcrumb\":{\"@id\":\"https:\/\/cronologia-universale.it\/en\/1984-2004\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/cronologia-universale.it\/en\/1984-2004\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/cronologia-universale.it\/en\/1984-2004\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/cronologia-universale.it\/en\/universal-cronology\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"1984 &#8211; 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