Welcome and News
See the ModMash mod pack https://mods.factorio.com/mod/modmash
https://www.youtube.com/watch?v=iHHEcAfH16A
Underground
2 sublevels available the second by research.
Multi level shafts, no character transport but larger and multi-level acts as buffer chest each level has unique logistic requests
No water below and no fluid transport so get ready to start barreling.
Underground power transfer stations can be used to transfer power from Nauvis to the next level down but can't reach the deep dark you'll have to use Battery Cells to jumpstart the level.
Be warned the bitters have a bad habit of digging.
Splinters
https://mods.factorio.com/mod/modmashsplinter
https://mods.factorio.com/mod/modmashsplintervalkyries
https://mods.factorio.com/mod/modmashsplinterairpurifier
https://mods.factorio.com/mod/modmashsplinterboom
https://mods.factorio.com/mod/modmashsplinterresources
https://mods.factorio.com/mod/modmashsplinterregenerative
https://mods.factorio.com/mod/modmashsplinterassembling
https://mods.factorio.com/mod/modmashsplinterelectronics
https://mods.factorio.com/mod/modmashsplinterenrichment
https://mods.factorio.com/mod/modmashsplinterfishing
https://mods.factorio.com/mod/modmashsplinterfluid
https://mods.factorio.com/mod/modmashsplinterlogistics
https://mods.factorio.com/mod/modmashsplinterloot
https://mods.factorio.com/mod/modmashsplinterrecycling
https://mods.factorio.com/mod/modmashsplinterrefinement
https://mods.factorio.com/mod/modmashsplinterregenerative
https://mods.factorio.com/mod/modmashsplintersubspacelogistics
https://mods.factorio.com/mod/modmashsplinterunderground
https://mods.factorio.com/mod/modmashsplinterdefense