Got any undersea ancestors (human, I mean)? Google Ocean will help you map out their old stomping grounds:
“Google is in the process of building a tool known as ‘Google Ocean’ to map the terrain of the ocean floors. Similar to Google Earth and Maps, Ocean will provide the base data (depth mesh and some imagery), and allow users to populate it with data for things like current, shipwrecks, coral reefs, etc.”
Note: May also prove helpful if your pirate ancestors left behind any buried booty!