Lean lessons from Columbia Space Shuttle disaster

I'm reviewing the content of the course content for the SCM master program I impart in ICIL. I  teach quality from a Lean point of view. I use videos to illustrate concepts explained in the class. As Space Race fan I wanted to use something related to explain quality concepts, I'm using the Columbia Space Shuttle disaster. 

It is a clear example of the importance of preventive actions, and how underestimating any factor can have a big impact with crises and unexpected problems. With just an EVA (Extra Vehicular Activity) and a visual inspection of the shuttle, they would have detected the damages made by the foam. 

Seven brave astronauts passed away due to this incident, and the shuttle program was delayed two years and a half. The new flight protocol included a visual inspection for damages, but it was too late for those seven heroes. Rest in peace up in space...