THE EXPANDABLE AIR-TUNNEL SLEEVE (BUILD BLUEPRINT)

Picture a long collapsed hallway the width of your shoulders.
Rock edges sharp as broken teeth.
Dust choking you.
No space to breathe or turn.

Now:

You thread in a folded tube.
You pump it.
It blooms.

And suddenly the path is:

• smooth
• safe
• breathable
• pressure-distributed
• wide enough for rescue
• stable enough not to shred somebody alive

That’s all.
A safe tunnel you can deploy like rolling out a carpet in hell.