I got on the “see everything from space” bandwagon back when Microsoft was running TerraServer and Keyhole had what would eventually become Google Earth. Google Earth has always been one of my favorite Android apps.
With the latest update, version 1.1, you can now view some underwater features in select areas. Want to give it a try? Download the app (or update your existing installation) and search for “Monterey Bay Canyon” (which is larger than the Grand Canyon).
Tap or pinch to zoom in until you’re below the ocean surface, then tap the “look around” button to tilt the view and take a look around.
Google Earth is free in the Android Market for Android 2.1+ devices.
(Source: Google Mobile Blog)