Overview: In this episode of Daily Planet, we begin with a company that's building personal submarines for deep water exploration and then take you back on land where a team of volunteers has built a fuel-efficient speed demon. After the break, we take you to the testing of a spacecraft hoping to carry mankind into space and then we have a two-part piece on the coverage of NASA's Green Flight Challenge. Plus, check out what it takes to re-introduce four grizzlies into their native habitat and to close off the show we head to the Scottish Highlands where ancient swordmaking techniques still exist today. Click for more info on these and more segments from this episode.