Paracrete or papercrete bags?

Wonder if anyone has any experience with or thoughts on using a partial or full paracrete or papercrete variation in the bags?
I am planning to build a small, round emergency shelter underground. I am a very small person, and not very strong. I'm going to be doing this project by myself, so want minimum weight to bags that will give me an effective wall. I'm just at the thinking it through stage.
Thanks for any advice.

While PC is fun, lightweight, fire-retardant (it dissolves rather than inflames), it is also very absorbant, loves to drink up the moisture. Unless the permies/builders have come up with an affordable, 100% guaranteed against absorbancy mixture, I would not use it for your support walls, especially not underground.
But, it does make for a nice insulating plaster to finish out your home.

I hope someone with deeper research with newest technology (resins, etc) will correct me and give you the green flag. I'd be interested in learning about the 100% guaranteed advances made too.

You may be able to use bags of cinders.

cheap , light, and easy to manipulate.

a few websites out there talk about it