Basics of undergrounds

Hello, ill teach you about undergrounds and what those red X mean.

How do i get to underground first of all?

Well, you can access underground with 2 tools, they are:
Shovel ( craftable )
Plastic spoon ( from lunch/breakfast room )
Multitool ( craftable )
Trovel ( findable )

Okay i got the thing, how do i dig now?

Hold the item that can dig to underground, like a sturdy shovel.
Now, stand around and you see a green square, click space if you want to dig to that spot
Now you see % decreasing
At 0, you click e and your in underground :D

I have soil after digging some space to underground, what do i do with it?

You flush them down the toilet obiviously OR you can gift them to guard to increase their opinion.

OMG THE GUARDS ARE ABOUT TO SEE THE HOLE HOW DO I COVER IT!?

First of all you can either cover it up with soil ( but you need to dig again )
Or you can cover it up with a desk ( my preferable choice )

Theres red X´s on the map, what are they?

Theyre blockages ways which means you cant mine through them.

Thanks for reading this guide :)

If i missed anything let me know down in the comment section :)

Extra info

You can upgrade your tools such as a pickaxe, shovel or cutters (not with trovels)
You even can make a multitool, which requires 70+ int.

[LegoNinja8411]

I do that all the time with extra contraband.

[skelet00n]

putting dirt in a desk that isnt yours works too, as it gets removed the next day

[Goodman]

i never dig out unless there's a perimeter brick wall, then sturdy shovel has been hired

[petrovitch8]

I just like to go to another prisoners cell and flush it down to be honest.

[NIKGOBOOM]

FlyingAtlas if it dose not have the x's yes :)

[FlyingAtlas]

Can I dig a hole from underground into warden's office? :P

[ChloeEmpurrs ΘΔ]

you can use a pickaxe to mine aswell. flimsy and light weight are as good as their shovel counter parts and a strudy one is better than a sturdy shovel

[NeutralStew]

if you gift a inmate soil there opinion goes down by alot, just flush it

[2scouts]

You can also use a Trowel to mine

[Cee]

Great! :P