With Google Earth 5.0, Google has filled in the big blue expanses otherwise known as the ocean giving you the ability to dive below the surface and view points of interest.
"...we have a much more detailed bathymetric map (the ocean floor), so you can actually drop below the surface and explore the nooks and crannies of the seafloor in 3D. While you're there you can explore thousands of data points including videos and images of ocean life, details on the best surf spots, logs of real ocean expeditions, and much more."
Additionally you can now get historical views of many landmarks and record your journey for later playback. Check out the video...
"...we have a much more detailed bathymetric map (the ocean floor), so you can actually drop below the surface and explore the nooks and crannies of the seafloor in 3D. While you're there you can explore thousands of data points including videos and images of ocean life, details on the best surf spots, logs of real ocean expeditions, and much more."
Additionally you can now get historical views of many landmarks and record your journey for later playback. Check out the video...
Source: Official Google Blog