Images of Austin Powers often come to people's heads when they hear about this. It's a sensor that can be deployed onto robotic submarines. It will create what's called a point cloud of the underwater asset it's looking at. If this microphone, say, were under water, the robot could come and sit in front it, take a scan of that microphone, and then provide a 3-D model of what you're seeing under there.
On November 1st, 2011. See this statement in context.