This sound was recorded two nights ago. Now a researcher has found evidence of some sort of underground activity in the area at the time.
http://www.youtube.com/watch?v=KgxKVZBqCXwStory Source:
http://thetruthbehindthescenes.wordpress.com/2011/03/21/bizarre-mystery-in-ground-shaking-flagler-county-florida-march-2011/ Dreamland Video podcast
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