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Very interesting ...
https://www.youtube.com/watch?v=I8-ARZE6wTo
Wow, instant tunnel.....
Here's another using Flexi-Arch from Macrete & Queens University in Belfast.
Wow, I am liking that, what an interesting entry way that would make for an earth-sheltered home! gravel bags and mud huts do belong!
"Behold the Power of the Brick" Indeed.