<p> Forty years ago, manned exploration of the moon was in full swing. The three greatest hacks of the Apollo program occurred on Apollo 12, 13, and 14, in two cases saving the mission, and in one case saving lives. Drawing on personal interviews with the engineers involved and archival records, this talk will look at the technical aspects of each hack, including largely overlooked, but critical, details of how the lunar module was prepared for lifeboat mode during the Apollo 13 crisis. </p>