In your Deep Course you will learn the relation between Freediving and Henry’s law, partial pressure with the Dalton’s law, risks of decompression sickness for freedivers and Nitrogen narcosis. As a diver descends to depth the increasing water pressure causes an increase in overall oxygen pressure, even as oxygen is being consumed. However, during ascent with water pressure and oxygen pressure decreasing, and oxygen supplies running low at the end of the dive, freediver blackout can come on quickly with little or no warning. The diver will experience the greatest decrease in oxygen pressure at about 10meters below the surface and shallower. After the diver inhales air at the surface, it takes about 20 heartbeats or 30 seconds for the fresh oxygen to travel to the brain. Until this circuit is complete, the diver continues to be in danger of blackout even though he is breathing and may have even signaled to his buddy that he is “okay.” Your instructor will focus on safety procedures, competition set ups and rules and high understanding of Freediving risks as you descent deeper and deeper in the Blue.