the mighty "costa concordia" from its watery grave. all day we have been watching them slowly raise this hulk of a ship that weighs at least 100,000 tons, and we're beginning the see results. you can just make out a line of rocks that goes around the ship's hull where it's been under water. more than twice the size of the "titanic," recovering this cruise ship is an unprecedented feat. never has a ship this big been raised from a reef where it crashed. it must be tilted upright using massive chains before it can be tugged back to port. workers have one chance to get this right, and the stakes are high. leave the ship behind and it could fall apart. the fuels and chemicals on board could pollute the famously pristine waters. almost two years ago, the cruise liner was navigating through shallow waters when it slammed in to a rock, ripping open a 230-foot gash across the hull. within minutes, water began to