Just watched the first video, amazed by the technique used in the vid.

Also reminded me of the second video, which is also pretty amazing.
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I Collected Every Illegal Item In Minecraft Hardcore
https://www.youtube.com/watch?v=rFO1iqDpMZU
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How far can you get from one block of bedrock in vanilla Minecraft?
https://www.youtube.com/watch?v=-OG4iOMGBMo