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Originally posted by TheRemedial
reply to post by Shadow Herder
No exhaust observed in OP
Originally posted by speculativeoptimist
In the spirit of ATS inquisitveness, I did a little digging on strange sounds and ran across this recent vid about sounds emanating from caves. The sound in the vid sounds a lot like the OP's vid, imo. So I tried to find if there were any cave systems around the area Beavis posted for the OP's story, and found in Marianna, FL, there is a cave system.
Going out on a limb here, but for the sake of speculation, check this out.
The sound starts at 2:35 and keeps going until it fades around 20 min later.