Every once in a while, a news story appears about someone who became lost at sea while aboard a cruise — either by tumbling overboard, or under more mysterious circumstances. In fact, the total number of these incidents is actually quite startling. From 2000-2013, about 200 passengers vanished without a trace while cruising. If it’s any consolation to those worried about accidents onboard, this number obviously includes some suicides, and not all those who fall overboard are lost forever; at least 10 people have been successfully plucked from the water during that same timespan — including one who was rescued after an unimaginable 18 hours.