English: A schematic of a self-emptying swim goggles. Self-emptying swim goggles could be used in situations when a person suddenly finds himself under water, without a swim goggles on. In this situation, the goggles must be strapped on underwater, where the goggles cannot be strapped on without having much water into them. This system allows the use of some air from the lungs (or from a additional oral nasal mask) to empty the goggles underwater.