Last month Google launched an updated version of Google Earth for Android with support for underwater imagery. This week the company rolled out the same features for the iOS version of Google Earth. That means you can comfortably explore the ocean’s depths from the comfort of your own home using an iPod touch, iPhone, or iPad.

Google Earth 3.1 for iOS includes a new Ocean layer which you can toggle on or off. Honestly, if you click on any random spot on the ocan, what you’re most likely to find is a blue screen with a bit of water imagery at the top indicating where the ocean stops and the sky begins. But there are also points of interest scattered around the big blue spots, allowing you to see information about underwater life, research stations, and landmarks… or seamarks.

The app also supports the retina display in the iPhone 4 and new iPod touch, for sharper graphics.

Google Earth for iOS is available as a free download from the app store.

Google has rolled out a new version of Google Earth for Android, and it makes up for a major oversight in earlier versions — the fact that 3/4ths of the earth is covered in water. Google Earth 1.1 for Android now includes underwater imagery.

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Not only can you explore underwater areas, but there’s also an “Explore the Ocean” layer which includes phtoos and videos from over 100 contributors.

Google Earth 1.1 also supports Adobe Flash if you’re on a phone running Android 2.2 with Flash installed. That means you can watch videos in a pop-up balloon without jumping out of Google Earth and into a separate video player.

You can read more about the new features in Google Earth for Android 1.1 at the Google Mobile web site. The app is available as a free download  for Android 2.1 and up.