AquaCAVE is a system for enhancing the swimming experience. Although swimming is considered to be one of the best exercises to maintain our health, swimming in a pool is normally monotonous; thus, maintaining its motivation is sometimes difficult. AquaCAVE is a computer-augmented swimming pool with rear-projection acrylic walls that surround a swimmer, providing a CAVE-like immersive stereoscopic projection environment. The swimmer wears goggles with liquid-crystal display (LCD) shutter glasses, and a pair of infrared cameras installed above the pool tracks the swimmer’s head position. Swimmers can be immersed into synthetic scenes, such as coral reefs, outer space, or any other computer generated environments. The system can also provide swimming training with projections such as record lines or swimming forms.