This update adds a lot more content for the ocean. First of all the update adds boats that the player can ride on. there are wooden boats and iron boats that are can be crafted. The golden boat you can only get from the pirate invasion. There is also ship wrecks that contain loot at the bottom of the ocean. There is up to 4 ship wrecks in the world. The new npc is the oversea merchant. It sells 8 random pre-hardmode items every time he comes but he comes a lot less than the traveling merchant. The new item is the aquarium that is crafted using 1 terrarium and 1 water bucket. You can put every type of fish in the game into the aquarium including the quest fish and the fishes that are tools (like the reaver shark).