Explore the shores of Udo Island and discover its thriving marine environment on an underwater submarine adventure. Udo Island, located northeast of Seongsan, is the largest island in the area. Dubbed "cow island" because of its interesting shape, the island boasts stunning nature and attracts over a million visitors a year. Discover Udo on a unique submarine tour to see its incredible variety of marine life. As your submarine changes depths, watch an amazing nature show unfold before your eyes and see different types fish and plant life found in the area. As you get back to the surface, enjoy wonderful views of the island and don’t forget to take pictures.