Browsing the internet, I came across several mentions of "strange sounds" and "Earth Groaning". This peaked my interest given this is the year of 2012.
So here are my findings.
@ 0:30 of this video, note the loud sound.
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@ ~1:58 of this video, also note the sound.
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Then finally, this video. Its very faint, but it you listen carefully, you can hear it.
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All these sounds seem to be the same thing. Ive read they could be anything from legitimate unknown sounds to rumored viral marketing attempt, to a flat out hoax of some kind. But for them to be a hoax, then how do you explain wide range of locations of the videos? And I can't imagine such loud, unknown sounds being allowed for marketing reasons as it could cause civil unrest of people trying to figure out whats going on.
Im interested to know what you all think of this and what you may have heard on the topic.