How Snorkeling Gear Works?

With a snorkel mask, the mouth and nose part is closed and you have separate areas for breathing in and out. If you exhale, you do not exhale the air through the valve, but via the side channels through a pipe. This prevents you from breathing in your own air again. The air goes out through the glass.

Do snorkels hold air?

The point of a snorkel is to give you a constant supply of fresh air while you swim. It's a pretty important function if you value being able to breathe… The snorkel top sits above the water allowing you to breathe air through the mouthpiece under the water.

Can you breathe underwater with a dry snorkel?

You cannot breathe underwater with a dry snorkel if the snorkel is completely submerged. There is simply not enough air trapped in the tube for you to breathe with! The point of the dry snorkel is to maximize your comfort at the surface by preventing any water from getting inside the tube.