The “perimeter” was prop’s mob-farm clearing method. In his words it was “literally blowing up every single solid block in a huge place down till bedrock to have maximum possible spawn rates”. 1 A TNT flying machine did the work over an area he put at 16 by 16 chunks. 2 Prop later turned the cleared space into his base.
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Primary sources
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perimeter = literally blowing up every single solid block in a huge place down till bedrock to have maximum possible spawn rates
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this is 16 by 16 chunks
