Tutorial: How to make a 3 by 3 tnt Cave Door. Minecraft java 1.17

Hi, I have nothing to type here, I mean I explained everything in the video. I felt awkward typing this. Note: This is only for Minecraft java it will not work in any other version 3 by 3 tnt door(a.k.a where I explain what a tnt door is): https://www.youtube.com/watch?v=XHQqPx-ba5g&t=359s