I had this really cool idea for a campaign, where the characters would all be on some boat that gets trapped in a very thick, silvery mist, and there are these hideous sea worm monsters in the mist, that dressed in the shredded, bloodied tuxedos and evening gowns of former victims, that speak backwards (for example: "Yrtneprac ylevol tahw! Enid ot ecalp enif a ekam lliw siht!")
Problem is, I have no knowledge whatsoever about boats in general. So many stories and movies take place on cruise ships ('Deep Rising' 'Ghost Ship' 'Poseidon Adventure' etc) that I wouldn't really want to do one of those, but I thought perhaps some large private luxury yaht, or a dank of freighter or passenger ship of some sort. Any ideas? Any ideal time period (I was thinking World War One era, possibly)? I appreciate the help.