Google has added 3D renderings of the ocean floor in its latest update since 4.3. Google Earth 5.0 is still free to download. Track gray whales, explore shipwrecks and see what the water looked like up to 50 years ago. Also in the new Google Earth are maps and satellite images of Mars, including probe landing spots, and you can save your toured places to share with other GE users.
Read More | Google Earth