John Hanke, director of Google Earth and Map, said, "Vast parts of it are largely unexplored and we don't really know what's down there."
While the visibility in the water has been cleaned up, everything you see is based on actual data. It's not quite swimming with the fishes, but it will let you see where they live.
Hanke showed Sieberg some impressive images that can be found with the new feature. "This is really an undersea canyon that is quite dramatic," Hanke said. "It's similar in scale to the Grand Canyon."
You can also click on icons to see photos and sometimes video of endangered species, like the Goliath Grouper, or even an odd-looking type of shrimp off the coast of Spain.
There's even a fish GPS - you can follow creatures that have been tagged, from above the water or below it.
A world-wide network of scientists will be constantly adding video, photos and underwater topography.
"Just as Google Earth has connected people to far off places and made them real, this is going to connect people to the ocean, and make it a much more real and accessible place," said Marine Biologist Stephanie Wear, from the Nature Conservancy.
The good news is you don't need to be a computer whiz or a marine biologist.
Once you download Google Earth, it's just a matter of double-clicking on the ocean to get more detail. Then scroll your mouse over different icons to see what lies beneath, or on the surface.
For tourists, students and landlubbers alike, it's a unique underwater adventure.
And, it's one that doesn't mean getting all wet.