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Good point that spaceflight is risky, it is placing humans in the most hostile environment he has ever faced.Yes, they were informed but trusted NASA's conclusions that the foam was little threat.
An EVA was not possible because the airlock hatch at the back of the mid-deck that is used for EVA's was connected to the spacelab in the payload bay. The only exit was through the main hatch on the side, which would have required depressurizing the entire cabin to use.
Not enough ready-to-go Soyuz craft would have been available and even if they were, Columbia was in an orbit that couldn't be reached by a Soyuz from Baikonur.
Netflix currently has a documentary
Challenger: The Final Flight.
It is written obviously is hindsight, and certainly may be biased.
One interesting thing it mentioned is one of the experienced astronauts suggesting that taking a teacher, or any nonprofessional astronaut (previous to this most if not all astronauts were either military or specifically civilian trained to BE astronauts) may have been inappropriate, sort of saying, “Space Travel is now so safe we can casually take an grade school teacher along for the ride.”
In medicine (at least in U,S,) we have added a “time out” mini “pre-procedure” briefing, in the operating room or invasive imaging procedure room, where a designated person gets everyone’s attention and we check the patient ID, the order, the SIDE of the procedure, to make sure we have the right patient and the right procedure and the correct side. The idea was (and still is) to avoid those supposedly one in a million cases (actually probably far. Ore frequent) where one or more of the above was incorrect, sometimes with minimal fallout and sometimes catastrophic. Problem is, it wasn’t long before the “time out” became so routine that you really had to work to get people to pay attention to it, since it was so relatively rare that we DIDN’T have everything right. I was having to remind people that we did this for a REASON ( meconium happens!), otherwise it turned into just “going through the motions.”
Routine, and especially SUCCESSFUL routine breeds complacency.
Something to remember next time you hook up your rocket chute or load your booster engine (zero delay?) , or whatever you guys and gals with electronic deployment do. Even checklists and supervision are only as good as the user and supervisor.