As Mike has pointed out, it won't happen. Many people have claimed to know someone who did this or know someone who's brother, best friend, cousin, etc did this but it simply will not happen since 9/11. Regs are there so that they can compare the manifest against known terrorists and thier alises etc. Another of the reasons this will not happen is that even if a passenger does not show up when the ship sets sail, they did purchase the use of this cabin and can and sometimes do show up at the next port of call to claim thier cabin. If a cabin is vacent they will usually take the chance to do a thorough cleaning and repair of anything that is out of place in this cabin that could not be done while a passenger is in there or in the few hours between sailings such as carpet replacement etc.
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