Underground belts

Overview

belt-type	factor speed	speed (tiles/sec)
File:Basic-transport-belt-to-ground.png Basic underground belt	1	1.875
File:Fast-transport-belt-to-ground.png Fast underground belt	2	3.75
File:Express-transport-belt-to-ground.png Express underground belt	3	5.625

(If not yet done, please read Transport belts, because we suppose some very basic belt behavior on this page.)

Underground belts move items like a normal belt, but can cross any entity without interfering them.

You can cross any number of entities or
other underground stuff (other underground belts or underground pipes). They wont be mixed or so. For the connection only the endpoints (entry-side and exit-side) are relevant.
The maximum distance underground is 5 tiles.
If you mine an underground belt, up to 20 items are recovered, the remaining items in the underground are placed into your inventory.
If you look very near, then you can see, that an underground belt is like a belt, but only half length. The rest of the tile is used for bringing the items "under ground".

This last fact is important, because it can be used to do some tricks.

Underground belts/Splitting lanes trick:
File:Split-swap.png
You can turn the order of the lanes or split the lanes completely with the underground belts trick