A Simple Oversight (Tic Tac Horror - English Edition)

When the ground under his feet began to vibrate, a much worse tremor crossed Ugo, wrinkling the back of his neck.
Oh, it was - literally - hellishly hot down there, and after so many years he could well say he knew the job, therefore, for nothing but the human desire to finish quickly, he had not (God is my witness, I always do!) looked at the Blueprint, and it happened: he accidentally loosened the bolt that holds the Universe together.