The mayor's 'ship came in'.
..........The message Lena delivered to the mayor, from one of his henchmen, was "his ship had come in". It is a common figure of speech but the Mayor had a large stash of can goods. Did he have someone on the outside who was finding canned food, as well as fruit and vegetables and literally bringing them in by boat or were other survivors on the surface. At the End he was planing to escape to some place.
TAG LINE: True genius is a beautiful thing, but ignorance is ugly to the bone.