described is an underwater oxygen bar . the underwater oxygen bar provides a new recreational experience that unites the unique aquatic experience of being in an underwater environment with the benefits and appeal of an oxygen bar . more specifically , an underwater oxygen bar is provided in which patrons may descend into a water tank wearing a breathing apparatus . once submerged , the patrons can move about the water tank and interact with an underwater appliance that provides a coupling to a source of an oxygen concentration . customers can enhance their oxygen experience by using various flavored scents to be added to the oxygen , such as lavender or mint .