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Well, I'm sure it's more than "been practiced". They lost two shuttles as I recall, one Apollo on the pad and it might have occurred during Apollo 13 until the

• rdtsc 5y ago
  Well Challenger was in 1986 and that's 17 years prior. I don't think I can recall the training materials from 5 years ago, but after 17 years things would definitely get fuzzy, especially during that kind of event.
• kevin_thibedeau 5y ago
  Skylab-3 had a fueling issue and there was a rescue Apollo module with two extra seats ready if needed.