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2. Diving mask - Wikipedia

   en.wikipedia.org/wiki/Diving_mask

   A diving mask (also half mask, dive mask or scuba mask) is an item of diving equipment that allows underwater divers, including scuba divers, free-divers, and snorkelers, to see clearly underwater. [1] [2] Surface supplied divers usually use a full face mask or diving helmet, but in some systems the half mask may be used. [2]

3. Doing It Right (scuba diving) - Wikipedia

   en.wikipedia.org/wiki/Doing_It_Right_(scuba_diving)

   The DIR view is that it is essential that divers master the skills of mask clearing, even if it takes many repetitions, as inability to adequately clear the mask leads to stress and distraction, and the dislodging of the mask during a stressful stage of a dive may then lead to panic. [25]

4. Diving procedures - Wikipedia

   en.wikipedia.org/wiki/Diving_procedures

   Surface supplied diving emergency procedures: Mask or helmet clearing – expelling water from the interior of a helmet or full-face mask. Bailout to scuba – Switching to scuba emergency gas supply. Bailout to pneumo hose – Using the pneumofathometer hose as an emergency gas supply.

5. Full-face diving mask - Wikipedia

   en.wikipedia.org/wiki/Full-face_diving_mask

   A diver in a pool wearing an AGA full face mask A diver wearing an Ocean Reef full face mask Head protection helmet for use with Ocean Reef full face diving mask. A full-face diving mask is a type of diving mask that seals the whole of the diver's face from the water and contains a mouthpiece, demand valve or constant flow gas supply that provides the diver with breathing gas. [1]

6. Scuba skills - Wikipedia

   en.wikipedia.org/wiki/Scuba_skills

   This can interfere with clear vision, requiring the diver to flush it out. Reasons for leakage include poor fit, stray hair breaking the seal, facial muscle movement that causes temporary leaks, or the impact of external objects against the mask. [12] Most diving masks can fog up due to condensation on the inside of the faceplate.

7. Diver training - Wikipedia

   en.wikipedia.org/wiki/Diver_training

   Standard diving skills include skills like buoyancy control, finning, mask clearing, pre-dive checks and diver communications. They are used all the time, and are seldom lost due to lack of practice. Usually the diver gets better at these skills over time due to frequent repetition.