Inflating and Deflating Your BCD at the Surface

Managing your buoyancy at the surface is a critical skill for comfort, safety, and control before and after every dive. Knowing when — and how much — to inflate or deflate your BCD helps you stay calm, conserve energy, and handle surface conditions efficiently.

Why It Matters

Before a dive: Proper deflation is necessary to descend efficiently without overexertion.
After a dive: Controlled inflation helps you stay positively buoyant, rest, and signal to the boat.
During surface swims or waiting: Surface buoyancy keeps you relaxed and out of trouble, especially in choppy water or current.
Many surface issues: fatigue, panic, and poor gas consumption — trace back to poorly managed buoyancy at the surface.

Inflating at the Surface

When to Inflate:

• Immediately upon surfacing at the end of the dive.
• Before beginning a long surface swim.
• While waiting for pickup or regrouping at the descent line.

How to Inflate:

• Use the low-pressure inflator (power inflate) in short bursts to gradually add air.
• Add just enough air to stay comfortably afloat without becoming unstable.
• In rough water, stay slightly negative at first to avoid being bounced around — then add air gradually as needed.

If Power Inflation Isn’t Working:

• Remove your regulator briefly to blow into the BCD inflator mouthpiece.
• Press and hold the oral inflate button while blowing in.
• Release the button before finishing your breath so no air escapes.
• Replace your regulator right after — do not remain at the surface without it.
• Use short, controlled breaths — you don’t need to fully inflate all at once.

Important:

• Keep your regulator in your mouth until you’re out of the water.
• Whether floating, swimming, signaling, or waiting, the reg is your safest option.
• There's no benefit to switching to your snorkel at the surface — even in calm water.
• Surge, current, or boat movement can pull you under when you least expect it.

Caution:

Too much air in your BCD can make it harder to stay upright or in place, especially in wind or surface current. You may drift more quickly, lose control of your position, or feel like you're being pushed around by the water. Avoid lying flat on your back if the BCD is too full — it can tip you into an awkward position.

Deflating at the Surface

When to Deflate:

• Just before beginning your descent.
• When preparing to descend along a mooring or down line.
• To reduce surface profile in wind or surge while stationary.

How to Deflate:

• Stay upright in the water and raise your inflator hose fully above your head.
• Press and hold the deflate button to release air in a controlled manner.
• Watch and feel your buoyancy — you want to become neutral, not negative.
• Begin your descent only when you're neutrally buoyant and in control.

Caution:

Don’t dump all your air at once — especially in shallow water or if you're underweighted, this can result in an uncontrolled descent. Always signal “OK” or “Descend” to your buddy before dropping — especially in current or limited visibility.

Real-World Tips

• Make inflating at the surface a habit — it should be automatic as soon as you break the surface.
• If your inflator fails, be ready to inflate orally — practice regularly.
• In surge, keep your body vertical and add air in small amounts to stay controlled.