The Challenger documentary on Netflix

Yes. I’ve seen it. What’s interesting about it to me is that it has approximately the same information as all prior docs explaining the catastrophe and history leading up to it, and manages to stretch out to four episodes what others covered in about an hour each.

This story has been beaten to death these last several decades. There's absolutely no reason to watch this 4 hour documentary when you can find fantastic 45 minute documentaries about Challenger on YouTube.

I didn't see it, but I can boil down the root cause for you.

The engineering company that won the contract and was responsible for the thruster rockets (O-ring seals) KNEW that if the temperature dipped below a certain amount the night before, the launch would be unsafe. NASA management wouldn't launch unless they and various other companies signed off that it was. The companies management had a meeting putting pressure on the engineering staff to sign. The company didn't want to upset NASA with another delay, and wanted to be awarded future contracts. NASA was putting pressure on them to sign, another delay made would them look inept.(With the teacher on board, this mission had higher media coverage).

NO engineers signed the OK to launch. The companies management however, did. The rest is tragic history.