Kirk orders Spock to Sick Bay, where McCoy finds evidence of extreme physical and emotional stress, a condition that will kill him within eight days if not treated. Spock is forced to explain that he is undergoing pon farr, a condition male Vulcans experience periodically throughout their adult life, and that he must mate or die. Kirk contacts Starfleet to request permission to divert to Vulcan but is denied. Kirk disobeys orders, believing that saving the life of his friend is more important than his career.