The simulations began early in the morning. More than once the astronauts perished because someone didn’t fix problems correctly or in time. In those cases, the crew and controllers held a short briefing afterward, discussed how they’d failed and what could be improved, then tried again. Over and over, scenarios were run, often for full days at a time, the more catastrophic the better, until repetition began to groove instinct into all the participants, and dying helped the men learn to survive.
