Strange Noises: Are they UFOs, thunder, HAARP or a hoax?

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• This sound is definitely not a train. When an entire city hears something, and then dozens of cities hears the same, we have to look outside the box.

• Sounds like it could be a tunnel being ground out. Sounds a bit like the machine could have bit off more than it could chew hence the noise.

• Wow that is awsum, the word is alive and I think it is hurting, moaning in pain, I would be to with all the world is doing for seven billion people. Can it be caused by the earth tilting? compasses are off, I am very excited about this.

• sounds like an underground railway amplified

• Trains and thunder?! Hahaha, they're getting lazy!

• I've read a lot of comments that these are viral videos for the next Cloverfield movie...

• do you see that some of these are the same ones, overlaid on other video?

• Its air escaping from tunnels in the under ground cities that exist where aliens co exist with the world governments of choice.

• There is something going on underground that is hidden from us. Everything from more frequent ufo sightings, aliens and crop circles, more understanding about our ancient past, the beginning of a new cycle/Age from dec 21st 2012, the proton cloud in the area of space our galaxy is now in, the intense Solar cycle we're in now, a spiritual evolution recognising our connection to Source without

• it is copy from voices of game CRYSIS2