Swimming-induced pulmonary edema (SIPE) is a potentially life-threatening condition that can affect swimmers of all abilities. The pathophysiology is not well understood and early identification strategies are not established. Handheld ultrasound is a validated tool for the identification of pulmonary edema and is not well-studied in this population. Understanding the incidence of signs of pulmonary edema and its usefulness as a sign of early pulmonary edema would be beneficial This study evaluates triathletes and open water swimmers at endurance events. A validated protocol for lung ultrasound is used to identify the signs of pulmonary edema. The findings will be analyzed for differences in experience level, type of athlete, gender, age, and environmental factors. The findings may then be used in the future to aid in the early identification and treatment of athletes and military personnel in similar situations to decrease morbidity and mortality.