Mask Squeeze in Diving – What Beginner Divers Need to Know
When we go diving, either scuba diving or freediving, the moment we descend, the pressure around us begins to increase. As we talked about earlier in Ear Equalization For Diving – A Guide to Scuba Diving and Freediving, because the deeper we go, the more the surrounding water compresses any air spaces in our body and in our equipment.
But your ears are not the only thing that needs attention underwater. Another important topic every diver should understand is called mask squeeze.
What exactly is mask squeeze?
Your diving mask creates an air space in front of your eyes. This is what allows you to see clearly underwater while exploring the reefs of the underwater world. The mask is designed to sit comfortably on your face, creating a soft seal without digging into your skin.
If the mask is worn too tightly, or if you forget to equalize the air inside while descending, pressure begins to build. As the outside pressure increases, it pushes the mask harder against your face. This is what we call mask squeeze, also known as facial barotrauma.
How does mask squeeze happen?
Water pressure increases as we go deeper. If we do not add a little air into the mask by gently exhaling through the nose, the air space becomes smaller. The pressure difference then pulls the soft tissues around the eyes and forehead inward, which can cause bruising.
In simple terms:
You descend.
The pressure increases.
The air inside the mask shrinks.
The mask presses tighter against your face.
If the mask was already too tight before entering the water, the effect becomes stronger.
What does mask squeeze feel like?
During the dive, you may notice the mask pressing against your face, especially around the forehead and eye sockets. It can feel snug, uncomfortable, or as if something is pulling on your skin.
After surfacing, some divers notice red marks around the mask, small blood spots in the whites of the eyes, or bruising around the eyebrows or cheeks. It can look worse than it feels. Most mild cases heal on their own. Even so, it is something we want to avoid, especially because prevention is very easy.
How to prevent mask squeeze?
Mask squeeze is one of the simplest problems to prevent in diving. Here are some tips
Choose a mask that fits comfortably.
Let the strap sit gently. The seal should be soft, not tight.
As you descend, exhale lightly through your nose to equalize the mask.
If you feel pressure, pause, add a little air into the mask, and then continue your descent.
In scuba diving, this quickly becomes a natural habit. In freediving, where descents are often faster, it is even more important to relax, equalize early, and avoid rushing.
Diving comfortably means diving safely
Understanding how pressure works and how to equalize both your ears and your mask helps you become a calmer and more confident diver. When your equipment feels comfortable, and you trust your skills, you can focus on enjoying the underwater world, the marine life, conservation work, and the peaceful atmosphere of Koh Tao.
Mask squeeze is not something to fear. It is simply a reminder that even small details matter in diving. With good habits and gentle equalization, your dives stay comfortable, fun, and safe.
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