Google Earth has had ocean imagery and tours for a while now. You can see a list of ocean tours here. Now you can see underwater ocean imagery in Google Maps too. Yesterday, Google released new underwater ocean imagery for Google Maps. There is not a lot of imagery yet, but what Google has published is quite impressive. Get started by taking a look at the sea turtle and fish below.
Applications for Education
The underwater Google Maps imagery is limited right now, but what imagery Google has published could be good for students to explore coral reefs in clear detail.