Do you breathe your tank down faster than your buddy? Here are 5 diving tips to help conserve your cylinder air and extend your bottom time.

1. Fix the small leaks
Even a tiny stream of bubbles from an O-ring or an inflator swivel adds up over 40 minutes, and may be a sign of more serious trouble ahead anyway. A mask that doesn’t seal is another kind of leak in that you have to constantly blow air into it to clear out the water. It’s also a source of stress, which needlessly elevates your breathing rate and thereby reduces your breathing efficiency. Does your octopus free-flow easily? That can dump a lot of air quickly. Detune it or mount it carefully so the mouthpiece points downward.

2. Dive More
Inexperienced divers are famous for burning through their air supply at a furious rate, so one of the best diving tips for saving air is to simply dive more often. You may not be a new diver, but unless you dive almost every week it’s still an unnatural activity. By diving more, your body will get used to the idea, and you’ll breathe less.

3. Swim Slowly
The energy cost of speed is even more than you might think:  Swim half as fast as you do now, and you’ll use less air.

4. Stay Shallow
Because your regulator has to deliver air at the same pressure as the water, a lungful at 10 meters (two atmospheres) takes twice as much out of your tank as does the same breath at the surface. At 30 meters (four atmospheres) it takes twice as much as at 10 meters. There’s absolutely nothing you can do about that except to avoid being deeper than you have to be. If you’re making a transit over an uninteresting sand flat to get to the edge of the drop-off, do it at 5 meters instead of at 15 meters and you’ll save air.

5. Minimize the Lead
If you’re overweighted with lead, you have to put more air into your BC to float it and be neutrally bouyant. The inflated BC is larger and requires more energy to push it through the water. An extra four kilos of lead means your BC is several liters bigger when inflated enough to make you neutral.