Futuristic cities rise above an endless alien ocean world

A planet entirely covered with water. Coming out of the water are colossal pylons and on top of each pylon is a gigantic, gleaming city with Strange alien archtecture. The cities are all covered in class domes. Each pylon is connected by tubular tramway mechanisms and space ships fly overhead. One of the massive pylons is a huge space port. At the Base of the Pylons, colossal waves crash against the ancient pylons that have stood for tons. Done in a fantastic and detailed science fiction style