Never heard of such a thing until i read this story earlier.
Seems Google use balloons to get Wi-fi to remote locations and one was seen plummeting to earth in New Zealand, prompting a full scale search operation as a worried passer by contacted authorities believing it was a plane!
These 12 metre high things float around in the stratosphere and last around 100 days before coming down. Apparently Google intend to send up over 400 of these things and you need a special aerial to get coverage.
Google have promised to repay the cost of recovery -which included a rescue boat & helicopter.