NASA defined the "Normal Day Accident"
Everything is as it was yesterday, then an unexpected catastrophe overtakes and just before you die a faint look of surprise crosses your face.
Somewhere on the web is the flow diagram that takes you from safe ops to the normal accident. Worth looking up.
Look at NASA'a ops today and you'll see a shed load of defense against that scenario.
Learn - Live. Live - Learn
Sir George Cayley