XLV District

in 2030, 5 years after the third world war that killed a third of the earth's population. The earth is hit by various natural disasters and the ozone layer is increasingly thinning, thereby increasing the volume of ocean water. Garbage piles accumulate over most of the earth and produce extremely toxic methane gas. The land became very hot and increasingly difficult to live in. The survivors then worked for hand in hand to build a network of giant caves on the ocean floor as cooler castles and dwellings. Oxygen becomes very valuable and becomes a means of exchange in the future. Oxygen-harvesting vessels rise and fall to the surface to harvest air. Various power stations and oxygen conversion are built to meet the needs of life until the earth regenerates itself in the future.