It's not Atlantis, let's find the Loch Ness Monster!
Google is supposed to be a search engine. But with all the 'extra's' they are serving you can hardly think of them as 'just a search engine' anymore. One of their 'extra's' however seemed to have found something interesting. And as you know searching leads to finding. Google Earth supposedly found the lost city of Atlantis.
The marks found are nothing more than "ship tracks", http://googleblog.blogspot.com/2009/02/atlantis-no-it-atlant-isnt.html. The ship tracks are the result of measuring the depth of the Ocean using sound waves. By measuring the time it takes for sound to travel from a ship to the sea floor and back you can find out how deep the ocean is at that point. The tracks are produced by the sounds.
According to Google lots of places like the one found near Africa can be found all over the Oceans. This one just is more clear then others because "the soundings produced by a ship are also about 1% deeper than the data we have in surrounding areas". This is caused by an error which make the tracks more visible than others.
If you think that Google has covered the entire ocean you're wrong. Echosounding might be the best way but it also takes a lot of time and money to do it. According to Google there is about 20,000 square kilometers of gaps between each different track. The other parts are not measured but predicted.
If Google would be echosounding the entire Ocean it would be using 200 ship-years. And though Google has got cars and even airplanes, they don't have that many ships to do the entire 'coverage'.
So Atlantis will stay hidden for a while. But maybe Google could go and hunt for the Loch Ness Monster...?
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