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One hundred and seventy-one people have vanished from cruise ships in the past decade. Here's the sad and depressing story of one of them, Rebecca Coriam. I wander into one of the bars and get talking to a waiter. "What's it like working here?" I ask. "It's all about the show," he replies. "When you're out among the guests, you're always on show. Even if you're a waiter, or a cleaner, or a deck hand." "How long have you been on board?" I ask. "S...