They grew used to the clang of bells sounding the hour, the cry of the gulls, the unintelligible gabble of Kerch. The ship was their kingdom, and the sea a vast moat that kept their enemies at bay.
-- Narrator ("Before")

Importance: Mal and Alina flee the Darkling and Ravka by ship. This quote is important because it demonstrates the feeling of safety they feel while aboard the ship.

Rusalye. The cursed prince, guardian of the Bone Road. In the stories, he lured lonely maidens onto his back and carried them, laughing, over the waves, until they were too far from shore to cry for help. Then he dove down, dragging them beneath the surface to his underwater palace. The girls wasted away, for there was nothing to eat there but coral and pearls. Rusalye wept and sang his mournful song over their bodies, then returned to the surface to claim another queen. Just...
-- Alina (Chapter 5)