OurAmazingPlanet. msnbc.msn.com updated 9/26/2012 3:51:26 PM ET A survey of underwater canyons off the U.S. East Coast found a number of previously unknown hotspots for deep-sea corals. The exploration, the first to look for corals and sponges in the area in decades, is helping researchers develop a computer model to determine where other coral hotspots […]