Underworld

When a player mines down the depths of the minecraft earth, they are soon met with an impenetrable layer called bedrock. There is no possible way to get pass it and no way to break the layer. But, what if we did not have to break it. What if there was an entrance that would lead to the other side. Introducing, the underworld! Deep beneath the minecraft earth you have a rare chance at discovering a new dungeon that leads to the underworld. What is the underworld? Well, the underworld is a new world beneath the overworked. You see, when you pass through the dungeon you will flip to the other side. The world gravity will flip and you will be able to escape the dungeon from the mouth of a structure of some sorts, into the underworld. The underworld would only be a hilly sand biome and stretch on. The new world would consist of only pyramids and discarded villages. Dry rivers and zero vegetation inhabit this new side to the overworked. How about it?