Woods Hole has made autonomous ocean gliders that power themselves using the temperature differential of surface and deep water. http://www.whoi.edu/page.do?pi

Woods Hole has made autonomous ocean gliders that power themselves using the temperature differential of surface and deep water. http://www.whoi.edu/page.do?pid=7545&tid=282&cid=37008&ct=162 http://www.whoi.edu/page.do?pid=7545&tid=282&cid=370...