This part will lead the visitor's imagination to the undersea world in Thailand to see marine creatures of different sizes, particularly large ones living at different levels of the sea from the sea surface, the middle of the sea and on the sea floor. They will be able to see frogmen feeding sea animals in the big tank and move through the tunnel, which lets the visitors enjoy the spectacular undersea scenery with sea animals swimming above their heads. There are also models of deep-sea fish for them to sample.