Mapping the seafloor with underwater drones

Just over 20 percent of the ocean floor is mapped today. U.S.-based startup Bedrock Ocean Exploration hopes to change that with its new breed of ocean technology: a seven-foot-long electric submarine equipped with sonars, cameras and lasers to help it navigate and catalogue the marine environment. CNN hears from the company's co-founder and CEO Anthony DiMare about how a fuller picture of the seabed could help marine industries build infrastructure without harming ocean life. Meanwhile, oceanographer Yi Chao has developed a way to power data-gathering machines renewably, harnessing energy from the ocean itself. He founded startup Seatrec in California to scale up the technology. From CNN's Inventing Tomorrow with Kristie Lu Stout...