This isn't a normal cruise, and these aren't normal passengers. They're on board what's known as a shakedown cruise, a final stress test before a cruise ship makes its public debut. The passengers are all Royal Caribbean employees and their guests, and their job is to push the ship to its limits.I boarded the Celebrity Excel just days before its maiden voyage. My goal to find out what it takes to launch a massive new cruise ship. It turns out even the smallest details are scrutinized.More feathers were need ...