their ship sinks to the bottom of the sea. this promotional video for the cruise lines shows one of their ships called the "sea diamond" sailing brilliantly through blue waters. its ten decks hold nearly 1,600 people which include jen and her daughter, alex. their cruise takes them to the pristine coast of santarini, greece, on a relatively calm and sunny day. >> well, you could see it's a beautiful day and we were all excited. >> jan is chaperoning her daughter's high school trip on what so far has been a fantastic experience. but on april 6th, 2007, their fourth day, alex doesn't have a good feeling. >> we looked really close to the bottom of the harbor. and i just, i pointed out to someone, we laughed about it and as we started walking out of the room, we felt the crash. >> we quickly met, and as we were standing there, we saw a lot of people come up and they were dripping wet. they had actually come up from