Scientists have invented the Prius of ocean-going submersibles - a new "green" robotic glider that runs on energy absorbed from the heat of the sea, rather than batteries.
The new underwater glider can stay at sea at least twice as long as previous submersibles that used battery power. It is the first autonomous underwater vehicle to travel great distances for extended periods running on green energy, according to the Woods Hole Oceanographic Institution (WHOI).
http://news.yahoo.com/s/livescience/200 ... onseasheat
