First I would like to say these can be extremely dangerous. I made mine by myself but that is HIGHLY not recommended and can lead to serious injury or even death. Do not be in denial about how dangerous this can be because it can be extremely dangerous. Always have someone there with you. I cannot stress enough how dangerous these can be.
In the middle of making this my camera broke and I couldn't take pictures of some of it but I will do the best I can to make this instructable good.
You can make your underground fort as deep as you want. Just keep in mind that the deeper you dig the bigger chance of collapse. Mine was made 6 feet on one side and 5 feet on the other because the area I made this on was going down hill. You can also make it as long and wide as you'd like.
Step 1: What You'll Need
What you will need:
A bucket (If necessary. I didn't need one.)
A saw if there are any tree roots you need to cut
A weather treated sheet of wood for the roof
A wheelbarrow to move extra dirt
Treated Wood (if you are not using the dirt as walls and would like to build a room.)
Step 2: Digging, Digging and More Digging.
Step 3: Building Your Room
I put a pallet down in the hole and nailed wood planks onto it and used that as the floor.
I put four wooden beams up that were nailed to the pallet
I got 8 wooden planks and made 2 go across from 1 beam to the other on each of the 4 beams.
I nailed sheets of wood onto those wooden planks that are connecting the beams to make walls
I connected the beams at top with 4 wooden planks
I got a sheet of wood for the door and connected it at top with a hinge.
Or you can skip all of that and just get a sheet of wood to cover the hole, cut a square out of that for the door, And get another sheet of wood to cover the hole in the door and connect it with a hinge. Just expect to see more bugs and snakes ect.
Step 4: Put Dirt Over Your Fort
Step 5: Disguising Your Fort
Step 6: Remove Excess Dirt.
Step 7: Bugs and Rain Etc.
As for bugs, I noticed a slug problem right away. The day after I made it there were around 3 slugs in it. I removed them but every time I go down there there is at least 1 slug down there. I sprayed bug spray and that prevented spiders from going down there but there are still slugs. I just have to live with it.
If you spray bug spray in yours then don't go down there for a while because bug spray has lots of chemicals.
Step 8: Finished!
Note: I have to clean mine up a bit