I think cruise ships are a great place for people who want to get rid of a meddlesome wife if they're so inclined. Just throw her overboard and say she must've gotten off the ship at one of the third world ports without having her room key scanned, and never got back on.Years ago I listened to this podcast from Binnall of America where he interviewed a Kendall Carver who runs the site, International Cruise Victims. It paints a horrifying look into how many people go missing on cruise ships and the amount of crime on them, its staggering and I will never set foot on a cruise ship Its also super interesting and a very deep rabbit hole to go into.
Disappearance of Rebecca Coriam
Article - The dark side of cruises
Cruise ships are kind of strange in a way. I went on a 7 day cruise at the end of last year, my first time and probably the last time I go for that long. But it's interesting how you can stop in these third world tourist towns and buy bags full of valiums and xanex in the pharmacies, which they strategically locate on the street right next to where the cruise ships dock. There are whore houses nearby as well. All these things that would get you in a bit of trouble at home are conveniently located a short distance from the dock. It's pretty neat.
EDIT: I thought of something else I witnessed on my single cruise and have heard from several others who had it happen on theirs. Someone on the ship with me did something that got them in enough trouble for the cruise ship security to confine them to their room the entire rest of the trip. It happened on the second night of a seven day cruise, so that's at least 5 full days of confinement in their room, and I'm pretty sure they had a regular room which is about half the size of a regular motel room and no windows. They didn't even have one of the nice state rooms that are larger with an open balcony you could go on for some fresh air. I heard they'll also quarantine people in their rooms if they get sick with something contagious like the flu or a stomach virus. This person did something illegal tho, cuz the police were waiting for them as soon as we disembarked back in the United States. A couple coworkers and friends told me about this happening on their cruises too.
There's usually at least one death or severe medical situation on every cruise too, according to people I met on the trip who go on a few cruises each year. They said that more times than not, some elderly person will end up dying of a heart attack or something similar during the trip. That's not all that shocking though, since they have over 1000 people on the ship IIRC, and a large percentage of them are very elderly.