Liquid Robotics’ chief of innovative applications, Edward Lu, a former astronaut, often remarks that we know more about outer space than we do about the oceans on which most of life on Earth depends for survival. The company’s Wave Glider, which looks like a surf board packed with instruments, is trying to change that. Company founder Roger Hine got the idea when an investor asked him how he would track the migratory routes of humpback whales. The gliders, which rely on wave motion to maintain a speed of around knots and count on solar energy to power transmitters that.