The Surfaces mod offers you the opportunity to exploit the natural resources of the planet through the ability to dig caverns of limitless depth (granted this may seem a little crazy, the time required to find resource nodes gets exponentially larger, especially when using RSO or other resource altering mods). In addition to adding underground resource-rich surfaces, this mod also allows players to create surfaces above the main surface ("nauvis") and will require them to build tiles before they can start utilizing sky surfaces. This mod provides the means to successfully transport liquids, items, electricity, players and circuit signals between these surfaces without requiring constant player interaction.