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Apollo 13 commander James Lovell and lunar module (LM) pilot Fred Haise marked up this page of their contingency checklist after an oxygen tank explosion forced the crew to move to the LM to survive their return to Earth. The LM power-down instructions they noted here and on two additional pages were radioed from Mission Control, in Houston, to conserve battery power for their four-day journey. The checklist sheets sold for $45 750.