This document summarizes an international research project called The Altitude Project, which aims to study the impact of different altitude training strategies on performance, technique, and health in elite swimmers. The project brings together scientists and elite swimmers from around the world to conduct testing and altitude training camps in Spain and compare the effects of high-intensity training at altitude versus training at sea level. The goals are to determine if and how altitude training improves swimming performance and abilities, to understand the underlying physiological mechanisms, and to monitor any health impacts. Funding is being sought from sports organizations and scientific bodies internationally.