Route your belts freely underground.
Mods introducing new content into the game.
Augmented or new ways of transporting materials - belts, inserters, pipes!
the belts on the underground layer wont delete when i hold right click on them.
This is a normal behavior from Space Exploration. To make the satellite view work, SE prevents players from mining anything on a different surface from where they are standing. You will need to modify Space Exploration, or use construction robots.