The Osaka Sea Resort opened at 10 a.m. and we spent almost 2.5 hours playing. The structure of the pavilion is like a big oil bucket. It simulates the seabed environment of the Pacific Ocean. There are seven layers in it. The animals can travel freely from the top to the downstream. The children can observe it closely. It's a bit noisy to meet a lot of Japanese primary school students coming to nature class, but it's also good for children to think about this form of understanding natural science.