sentences:  Decompression is still far from being an exact science, and divers when diving deep must make many decisions based on personal experience rather than scientific knowledge.In technical diving, applying the oxygen window effect by using decompression gases with high ppO2 increases decompression efficiency and allows shorter decompression stops.Reducing decompression time can be important to reduce time spent at shallow depths in open water (avoiding dangers such as water currents and boat traffic), and to reduce the physical stress imposed on the diver.