If DCI does happen, proper treatment is very important. First aid for DCI is immediate administration of 100% oxygen either through a demand mask that cover’s the patient’s face and delivers oxygen when the patient breathes. If the patient cannot tolerate a demand mask, a nonbreatheable, free-flow mask can be used with a flow rate set to 15 liters per minute. Masks should seal to the patients face so that maximum O2 is delivered to the patient. Air leaks in the mask will dilute the O2 percentage inspired. Do not use less than 100% oxygen as a way to prolong oxygen supply. Divers Alert Network (DAN) offers a variety of oxygen kits for the diving community as well as training in their use.