Silo - By Hugh Howey - May 5th

Can someone please explains.

What ultimately caused the silo fail? Was it something IT should or shouldn't have done. Also the safety procedure presumably can address it?
 
I'm halfway into the third book (Dust) so tbh it gets confusing what happened in each, but on the above question -

What do you mean by the 'Silo failing'?
 
Is their a conclusion to it all in the books?...Like is the story finished or is this going to end up a complete mess at the end?
 
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