The Advanced Nitrox Diver course is an introduction to technical diving. Covering twinsets, states, and an introduction to decompression diving and using high oxygen decompression mixes. Advanced Nitrox allows you to increase the dive time you have by running past the no decompression limit. You will be trained to use up the 50% oxygen as a decompression gas to allow you extra time over what you get as a basic Nitrox diver.