Hearing conservation for divers and swimmers has been overlooked nearly everywhere in the world. Because submerging a listener changes his or her auditory physiology dramatically, the research upon which we base exposure limits for airborne noise is not pertinent under water. Of the research that is necessary for developing a damage-risk standard for underwater noise exposure, only a negligible amount has been done. The value of Poland's marine industries and the motivation of its audiologists make Poland and ideal country in which to accomplish this research and to develop the foundation for national and international standards.