During a discharge physical examination, one of the crewman was discovered to have an active case of tuberculosis in an advanced stage. Due to the close environment and isolated atmosphere of the submarine, the crew was transferred to the United States Naval Hospital, St. Albans, N.Y., for three days of intensive tests. Following laboratory analysis, it was found that no other active cases existed, and the crew was returned to the submarine. Because of the unique living conditions of submarine life, "Sea Owl" served as a control group for clinical research for the Tuberculosis Service, Bureau of Medicine and Surgery.