Not a perpetual motion machine, but close enough. Billed as a 'green' submersible, it 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.All your seas are belong to us.
"This glider allows longer missions than previous [battery-run] versions," said Ben Hodges, a physical oceanographer at WHOI."It could be out there for a year or two years. None of the old ones could go beyond six months.
The torpedo-shaped glider moves through the ocean by changing its buoyancy to dive and surface, unlike motorized, propeller-driven undersea vehicles.
