What about taking a page from Allegheny Uprising? Mammoth Cave is about 40-50 miles straight down I-65 from Ft. Knox. Gov't misinformation about checking the caves out as shelters but finding growing instability in the rock structure. You'd have lots of geeky-nerdy guys with headlamps and seismic sensors and technical trucks going back and forth all day for a month, finally resulting in the cave being "closed until further notice due to severe cave-in danger". Add several loud crashing rockfalls, "killing" and "injuring" several investigators (good wound moulage and lots of screaming/moaning as they are loaded into ambulances) and obscuring the entrance from within, and you have a place that people can't/won't want to get into.
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"Let's roll." Todd Beamer, aboard United Flight 93 over western Pennsylvania, September 11, 2001.
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