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I'm playing Skyblock, and after getting my cobblestone generator working, I'm planning on a total revamp of my entire little sky-island. However, I want to make certain that I don't lose important stuff (like dirt), so I want to build a safety net under my island.

So I'm left with a problem very similar to this one: "Is it possible to lay a block adjacent to another without looking at the face of the existing block?", except I need to build down so shift doesn't help.

How can I do this?

Oh, and there is no ground, it's just void beneath me, so dropping sand or gravel is out of the question (that, and I have no sand or gravel to drop).

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Purely out of curiosity, what happens when things fall to the bottom of the world? Do they vanish, or is there a layer of solid material at the bottom that is just too far down for you to fall to safely? –  jprete Nov 12 '11 at 4:10
    
@jprete "The Void" is the name for territory officially outside the world. Things that fall into The Void are deleted. This includes, well, everything. So, the answer is that they vanish. Note that usually there is a layer of unbreakable blocks (bedrock) at the bottom of the world, but I'm playing a specially made map without those. –  John the Green Nov 12 '11 at 4:36
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3 Answers

up vote 25 down vote accepted
+200

Place water and lava on adjacent sides of the block.

Top view:

  D L
  W

When they flow it creates a column of cobble you can dig through.

Side view:

  W D L
↓ ↓ C ↓ ↓
↓ ↓ C ↓ ↓
↓ ↓ C ↓ ↓
↓ ↓ C ↓ ↓
D = Dirt
C = Cobblestone
W = Water
L = Lava
↓ = Flowing water/lava
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4  
Bonus points for being safer and generating cobblestone instead of requiring it. –  John the Green Nov 11 '11 at 22:41
3  
This is a good way, but make sure to put the lava down before the water. Otherwise, your lava gets turned into obsidian. –  Istvan Chung Nov 30 '11 at 21:36
    
Is it just me or is there a mismatch between the side and top view? –  Hello World Apr 14 at 5:15
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Use water scaffolding.

Check out this video at about 10:00 to see water scaffolding in use.

enter image description here

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1  
Oh wow. I think I'll practice that with an empty inventory for a while. –  John the Green Nov 11 '11 at 20:35
    
It worked! First try too! Thanks! –  John the Green Nov 11 '11 at 20:43
1  
Would you happen to know of a way that will work in the Nether also? –  John the Green Nov 11 '11 at 20:58
    
And while you have a waterfall, generate a lavafall nearby (be careful to not turn your lava source into obsidian!) for a nice big batch of cobblestone going all the way down. –  Martin Sojka Nov 11 '11 at 21:02
    
@MartinSojka I tried that several times, because I knew I had got it to work before, but I'd had to start over and couldn't get it working again. –  John the Green Nov 11 '11 at 22:24
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build 2 rows of 2 separated by 1 space out horizontally from the edge. Put lava on the edge so it spreads over the 2 blocks - cover the lava with a block - put water on the block you have covered it with (preferably channelled with other blocks.

eg first layer looking down from above (. is empty space)

CCD
.LD
CCD

second layer (A = Any solid block)

.AA
.AA 
.AA

third layer

.A 
.WA
.A

Remove water, place in cobblestone generator - remove covering blocks, get lava and place in generator - get enough for a platform under the dirt. Pillar down on the column you created, and make your platform - I would suggest three below the bottom of the dirt as this places you on a nice level for the bridge to the sand island, no risk of accidentally knocking it and, once you have thinned the dirt overhead to the top layer, you can put cobble stone directly under it leaving room on the platform for other builds

(Hint I have used slabs for the bridge to the sand, uses half the amount of cobblestone)

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Hi Heregerifa, welcome to the Arqade! I used the code markup (four spaces in front of lines, or click the {} button when marking the lines) to make your instructions hopefully more legible. Also, there's no rush, so no ones blames you for nto swppaing lteters ;-) –  Zommuter Sep 1 '12 at 21:31
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