The Okinawa Churaumi Aquarium is famous all over the world for its third largest aquarium tank in the world, "The Sea of ??Black Current", which contains 7500 tons of water. A huge glass curtain wall, which is 8.2 meters high, 22.5 meters long and 60 cm thick and runs through the first and second floors of the aquarium, displays the underwater world inside the aquarium thoroughly.