A team of doctors travels to Mount Everest not to summit for sport but to study oxygen deprivation, using the mountain's thin air as a natural laboratory for what happens to intensive care patients whose bodies stop getting enough oxygen. Volunteers, including identical twins Jenn Price and Jan Taylor, are tested at altitude so researchers can compare how their bodies adapt under matched genetic conditions, isolating environment from biology. Blood samples, oxygen saturation readings, and physical exams are taken as the climbers ascend and their bodies begin to struggle, mirroring the crisis point ICU patients reach when ventilators and organs fail to deliver enough oxygen to tissue. The film follows the expedition's physical toll alongside the medical reasoning behind it, cutting between mountainside testing and the doctors explaining what each result might mean for treating critically ill patients back in hospital wards. The stakes are practical rather than dramatic: better understanding of hypoxia could change how intensive care units manage patients on the edge of oxygen failure.