The creation of the checklist was a controlled frenzy in which solutions were developed, rejected, and replaced in such rapid-fire sequence that it was difficult at any one moment to be sure how far they had to go. On Thursday, when the Apollo 13 crew inquired about progress, CapCom Joe Kerwin assured them, deadpan, that the checklist would be ready “by Saturday or Sunday at the latest.” Splashdown was Friday.