In this condition there are innumerable fluid-filled cysts in the kidneys. Early on this offers little or no risk due to diving since there is no abrogation of Boyle’s law. However, the condition would be dangerous from other aspects due to the possibility of anemia, azotemia and infection. The cysts of this disease are fluid -filled and therefore would not be subject to the effects of pressure/volume changes. In later stages of the condition problems of alertness and changes in sensorium due to azotemia would be important to take into consideration. There is also the problem of possible anemia with low oxygen carrying potential.