Minecraft wiki entry for Drowned_farming, associated text: In an underwater farm, naturally-spawned drowned are attracted to a location and funneled into one area where the player can kill them. A villager is typically used as bait to attract drowned, and the funneling can be accomplished with bubble columns. Transporting a villager to an undersea room in survival mode is a complex undertaking that requires much forethought, preparation, implementation time, and risk.