Underground Network

An underground network is the largest structure yet. It comes in at 1.30 "Galilean Update". An underground network is just a system of tunnels deep underground. They spawn thousands of blocks apart and are usually thousands of blocks in length, width. On the y axis, they are usually a few dozen blocks thick. They can spawn in all dimensions except for the End. There are rooms and corridors, both small and large, inside.
== Rooms ==
The Rooms are full of mysteriousness. Rooms can be anywhere from 12 to dozens of blocks in length, width, and depth. They have chests full of loot, spiderwebs, loads of undead mobs and undead mob spawners, and Dirivin Crystals. Chests usually have anywhere form 1-10 dirivin crystals. Large sword depositories are found here. In Nether networks, even partially built Wither builds can be seen. Some rooms can have huge piles of chests loaded with dysprosium, zersium, and terbium blocks. (only rooms near places with abnormally large veins of those ores given)
=== Nether network exclusive features ===
* Partially complete wither builds
* Netherite tool, weapon, and armor abundancy
* Gold block abundancy
* Relatively a lot of potion material and blaze powder
== To-Surface Tunnels ==
Underground networks have some tunnels from them that shoot upwards to the surface. In the overworld, those tunnels usually lead to villages and desert temples. Ocean monuments can even be attached to an "underground network". In the nether, they can even trail onto a fortress or a castle. Some soulsand patches even have connections (like doors that lead to networks). Natural structures can sometimes have these tunnels attached to them. They appear to have been made for "coming up from the ground". Villages usually have wooden blocks to cover tunnels. Caves will sometimes have impacting tunnels.
== Makeup ==
Networks are made up of different stuff depending on the dimension.
* Overworld: Cobblestone
* Nether: Nether Brick
* Ferro: Iron Block
* FREOX: Ice-7
* The Moon: Lunar Brick
* Everywhere else: There's no specific substance. It uses the ambient block to build.