Moorings left on the ocean floor for a year or longer are retrieved by returning ships. Sensors in them continuously record temperatures and passing currents, in this case, in Antarctica’s Ross Sea. Lamont scientist Bruce Huber is at right. http://blogs.ei.columbia.edu/2012/07/09/investigating-the-world%E2%80%99s-oceans-pole-to-pole-and-deep-below-the-bottom/
