I'll show you how to use the x-ray glitch in Minecraft 1.21.
For this glitch you need 1 lever, 1 piston, 1 slab and 1 bucket with water or trapdoor,
Now you need to lie down, to do this you can use water bucket like this, or trapdoor like this, now repeat the steps as in the video.
Turn on lever, look under you, and now we can see caves, mines and other stuff,
Im also recommend to use potion of night vision and use spyglasses or optifine to better vision, to see the ores better and I hope this video was helpful, goodbye.

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