[FReepaholic]

...The whole mountain is settling,,,the roof of this mine is still in place,,,it’s the walls that are blowing in from the pressure,,,goes off with explosive force...

I imagine that's why you see chain-link fencing all along the walls and ceiling. To try to hold back some of the debris shooting from the walls/ceilings during a bounce.

[1COUNTER-MORTER-68]

I imagine that’s why you see chain-link fencing all along the walls and ceiling. To try to hold back some of the debris shooting from the walls/ceilings during a bounce.
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Correct,,,Nothing that they do will hold that mountain up at this point,,,the hole under it is just too big,,,