How do I build down?

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).

Answer

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

Attribution
Source : Link , Question Author : John the Green , Answer Author : ChrisF

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