You thought the deep ocean biomes were as deep as it got? No sir-E! The open ocean biome makes up the most of the sea now. Where it borders other oceanic biomes, it will have a drop-off. It's not as deep as the abyss, and also forms these drop offs when bordering the abyss. But what lives here? Seems pretty barren without the kelp. Well, you can find whales for one! This where most whales live, as it's deeper than deep oceans and therefore has more room. It's also home to pelagic fish like tuna, salmon, mackerel, different kinds of sharks, mahi-mahi, swordfish, sardines, and leatherback turtles, as well as dolphins. Dolphins will appear as burrunan dolphins. Also, at night or in rain, guardians will spawn, so be careful when traveling the seven seas. If you need a source of food, hardtack is crafted with three wheat and one salt, and actually gives more food if you're in a boat.