Walk on the ocean floor using Google map

Google map added a new  feature underwater panoramic images:
http://maps.google.com/help/maps/streetview/gallery.html#!/ocean
In future, you can explore the ocean in  the same way as current street map on Google.

Video: Explore the ocean with Google Maps 
 Google Maps strives to provide people around the globe with the most comprehensive, accurate and usable map of the world - including the underwater world.