Luck was a significant factor, however. There were _so many_ things that could have gone wrong, that is not an understatement at all. They found bugs in the AGC

Luck was a significant factor, however. There were _so many_ things that could have gone wrong, that is not an understatement at all. They found bugs in the AGC's software years later that could have sent 3 men to their deaths, had they occurred.