how are things?
I'm looking for the title of an old sci-fi B movie (B/W). It is about a tourist cruise, perhaps an ocean liner, that gets lost in a kind of fog. When the fog clears, they realize that the ship is trapped between some giant spiny algae that do not allow them to move the ship. From a nearby island, men approach using balloons tied to their backs and large snowshoes to walk above the plants, which can attack and devour humans. The passengers of the ship are taken by these men to their regent, who governs a feudal state and who can condemn them to death, throwing them into a pit near the throne where the carnivorous plants are.