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Step 1
Learn the buddy system for sharing spare air as one method. In the chest area of a scuba diving outfit, there is an "alternate" air supply. This spare air is designed to be used by you or a diving buddy in trouble. (It is best to scuba dive in pairs, not alone.) Get into the habit of looking to see where and how your buddy secures the alternate air source on his chest gear so you'll be prepared to use spare air when scuba diving.
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Step 2
Get your buddy's attention first when you need to use spare air while scuba diving. The spare air supply should be easily accessible and you should be able to free it with a firm tug. Your buddy should have already offered you his second stage mouthpiece. But in an emergency, he may not be thinking clearly. Locate and secure it on your own and begin breathing as calmly as possible.
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Step 3
Consider using a "pony" tank as an alternative. You can use this type of spare air when scuba diving independently. A pony tank is a small scuba diving tank. It is strapped beside your main scuba air tank and it has its own regulator. A pony bottle adds extra bulk to your gear, but it also adds extra security in case you get separated from your group or diving buddy.
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Step 4
Secure your spare air to your chest in the triangle that is formed by your chin and the lower corners of your rib cage. Whichever spare air source you choose to use when scuba diving, make sure it is tightly in place so that it doesn't drag, but also make sure that it will release quickly in an emergency.
