Google Earth has released its latest version, 6.0.2.2074. The latest download, available free, now has a new ocean layer, which allows you to explore undersea. With additional content from partners such as the BBC and National Geographic, it is possible to examine 3D shipwrecks, such as the Titanic. Google Earth has also incorporated 'global change' imagery, allowing you to view an area through time, with decades of historic images.