OK I believe these groaning sounds are the warning of the birth of the antichrist, and the birth of the tribulation.   Listen to the sounds.    The movie Legion is a good representation of the birth of the tribulation.    Now in the movie Legion, Michael the archangel is cast down to Earth, which totally reminded me of the devil being cast down to Earth for the tribulation.   In a sense, the movie itself is a little warped with this, but I have a feeling it is to make people believe that fallen angels are good.   But nonetheless, I think Gabriel in the movie is AWESOME!   And that is who we are waiting to hear our trumpet from. 

The Arrival of Gabriel the Archangel, here the trumpets at :33, then :47
http://www.youtube.com/watch?v=qU7PY7ZG7SA&feature=related

Now watch Dutchsinse's video at :23, :45, 1:12, 6:41
http://www.youtube.com/watch?v=GZ2ZcmMxehk

News articles: FAIR USE FOR EDUCATIONAL AND DISCUSSION PURPOSES
http://www.costaricanewssite.com/strange-sound-heard-throughout-costa-rica
http://news.gather.com/viewArticle.action?articleId=281474981033747
http://news.gather.com/viewArticle.action?articleId=281474981033362
http://news.gather.com/viewArticle.action?articleId=281474981034081

They are pretty similar guys!    Now some people will always be hoaxing, but in this instance I think that not all of them are hoaxers.   While I might have thought it to be a joke maybe 3 or 4 years ago, not this time.   The sign of the fish disappearing in Norway WAS the sign of the rapture.   So right after that, these sounds are here.   They are announcing to us to GET READY, GET READY, GET READY.   Saturn was birthed 11-11-11 and Saturn is being birthed again on 7-21-2012 (we are talking about a born again Satan the dragon...how is Satan "born again" unless he is thrown to Earth for the tribulation).   But in the same week these are happening ALL OVER THE WORLD???

This is why I believe the sounds started picking up from November to now.   It is announcing the birth of the beast  and the mark of the beast coming in this year of the dragon....Hello Revelation chapter 12.