Origami triangle tank illustration tutorial

A few days ago, several friends were asking if there was a tutorial on how to insert a triangle into a tank. I searched for a long time and found one, but there was no source. If anyone knows the author, tell me so I can change the author of the tutorial to his name. , it’s also a good idea to learn from him. Now I share this with everyone, and please help me take a look.

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< img alt="Illustrated tutorial on origami triangle and tank" src="https://img.111diy.com/timthumb.php?src=/d/file/20220222/u5500240hui.jpg" />