Our story on the Tennessee Caverns helping keep us safe on NBC Nightly News. www.nbcnews.com/nightly-news/video/these-tennessee-caverns-are-critical-in-detecting-secret-seismic-activity-across-the-globe-1332907075958?v=railb& <www.nbcnews.com/nightly-news/video/these-tennessee-caverns-are-critical-in-detecting-secret-seismic-activity-across-the-globe-1332907075958?v=railb&>
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