Once you are a certified diver you soon realize that you would like to spend longer periods of time on dives, but you are restricted by the air you are breathing as well as the nitrogen you are absorbing. Enriched Air Diving is the first step in the direction of longer bottom times with shorter surface intervals between each dive. Join the many divers who have switched to a better breathing medium with the PADI Enriched Air Diving Course. This manual will give you the required knowledge to complete the entry level course and become a more efficient diver who can now make dives not available to your air diving counter parts.