From Halopedia, the Halo wiki
After the Spirit of Fire sacrificed its slipspace drive during the Battle of Trove, Lieutenant Kwan entered cryosleep in Cryo-bay Foxtrot 7 for the long voyage back to UNSC-controlled space. Nearly six years later in 2537, an engineering specialist was attacked by a stowaway Pod infector and was overtaken by the parasite. Serina, having begun the early stages of rampancy, failed to take full measures and instead locked the resultant flood combat form in the cryo-bay for study. After three days of study and observation, Serina witnessed the infected enter the carrier stage and spawn more infectors. Able to absorb a host's knowledge, the Flood utilized the engineer's knowledge of cryo chamber codes to awaken and infect more crew members. Lieutenant Kwan was abruptly awoken from cryostasis and immediately infected, turning into a combat form. The Flood then sought to escape from Serina's lockdown by using Kwan's knowledge of the ship's override codes. Spartan Jerome-092, who had been awoken from stasis in the same bay, began to exterminate infected crew members who could potentially escape the locked bay, remorsefully killing the infected Lieutenant first. The brief Flood infestation aboard the ship was ultimately eradicated due to the efforts of Jerome, Serina, and Professor Ellen Anders.
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