What is the most efficient way to clear an area in Minecraft?

I have an underground village all planned out on graph paper, and am ready to start building it. I have decided to have three block thick walls, with the middle being obsidian. Overall, I need a space 53 blocks long, 53 blocks wide, and 31 blocks high. What would be the most efficient way to do this?

Answer

BOOOOOOOOOM!!!!!

Attribution
Source : Link , Question Author : fr00ty_l00ps , Answer Author : fredley

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