How deep can you dive with full face snorkel mask?

How do you dive deep with a snorkel mask?

The mask should seal around your eyes and nose. Lay flat on the water face-down. Then gently bite on the mouthpiece of the snorkel letting your lips seal around it holding it in place. Take slow, deep breaths without panicking – you can hear your breathing through the snorkel barrel – simply get into a rhythm.

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