I think being stranded out in the middle of the ocean is intimidating. Whether a killer shark is after you, maybe the boat or ship is haunted. I’ve watched the game boy color game, Resident Evil Gaiden, and that game really sets the bar to me as to how scary being in the middle of nowhere in the ocean can be. With packs of zombies on board and a deadly bioweapon as well, with no way out.
A shipping container in remote Antarctica, with a cake iced with the name of your kidnapper. Sooner or later you gotta eat that cake and the only evidence of who put you in there.
You’ve probably got time to smear the kidnappers name in poop before your freeze to death. Failing that, drawing blood with which to write should be relatively simple.
“The wall just says ‘Kevin.’” “You heard the man! Round up all the Kevins!”