Equalization is how you balance the pressure in your ears and sinuses against the increasing pressure of the water as you descend. Done early and gently, it is effortless. Done late or forcefully, it can injure your eardrum or sinuses. Good equalization habits are among the first safety skills every freediver should master.
The core principle: early and often
Begin equalizing at the surface or in the very first meter, and continue in small, frequent steps as you go down. If you wait until you feel pressure or pain, you have already waited too long. Pressure changes fastest near the surface, so the shallow zone is where attentive, gentle equalization matters most.
Gentle is the goal
A correct equalization is soft and easy. If you find yourself straining hard, your technique or timing is off — ease up rather than pushing harder.
When something feels wrong
Pain is a clear instruction to stop descending. If an ear will not clear:
- Stop your descent immediately.
- Ascend a little until the pressure eases.
- Try a gentle equalization again; if it clears, continue carefully.
- If it still will not clear, end the dive — there is no depth worth an ear injury.
Never force it
Forcing equalization against a blocked ear can rupture the eardrum, and a sudden flood of cold water into the inner ear can cause violent dizziness and disorientation underwater — dangerous for a breath-hold diver. When in doubt, come up.
Do not dive congested
A cold, allergies, or congestion makes equalization difficult and unreliable. Avoid diving when blocked up, and do not lean on decongestant medication to push through — if it wears off at depth, your airways can swell shut and trap pressure. Rest and dive another day instead.
Equalization technique is best learned hands-on with a qualified instructor who can match a method to your anatomy. Treat this as background education, not personalized medical or training advice.
Habits that make it easier
Equalization is far smoother when the rest of your dive is relaxed. Tension in the jaw, throat, and shoulders makes clearing harder, so a calm, unhurried descent helps your ears as much as your breath-hold. Descending feet-first in early training, or slowing down as you go deeper, also gives you more time to keep up with the pressure changes.
Practicing equalization on land, dry and gentle, helps you learn the feeling of clearing without straining. The goal is always the same: small, frequent, soft equalizations that stay ahead of the pressure, with an immediate willingness to stop and turn around the moment your ears protest.