IGG has posted a lengthy introduction to the world beneath the seas and the creatures that inhabit it in their Chinese martial arts MMORPG, Zu Online.
In Zu Online, Zu Mountain is not simply the name of a world but the general term for the human world, ghostdom and paradise. Thus, Zu Mountain is a space as vast as the universe. In Zu Online, there exists a gorgeous submarine world, where there is beautiful scenery everywhere. In the submarine world, there is a luxurious palace called Ziin Palace. Ziin Palace's main shrine is Yellow Crystal Palace which is built and decorated using the most precious materials available and is especially luxurious and splendid. That's why Ziin Palace is called a submarine paradise. However, this beautiful submarine world is not as quiet and peaceful as it looks, it's also filled with danger.