Atlantis "found" in google maps

The legendary island of Atlantis seems to be found in google maps due to the new ocean map feature of google earth. There is a pattern found 1000km east of the coast of Marroco which look's like a layout of a city. It is 137km long and 114 km wide. So what is the structure? Actually, there is no structure there. It's merely a grid of higher resolution sounding data amid a lower-resolution dataset, taken from a ship surveying the area: