You seem unable to comprehend what is being discussed regarding the bolt failure. The stupidity isn't mine.
You asked if I was a Big Dig engineer. That was a stupid question. Only a stupid person would think that someone involved with the Big Dig would be disusing the issue on a forum such as this. That is why you asked the stupid question. Tell me why it was a smart question, if you believe it was not a stupid question, then I will revise my opinion of you being a stupid person.