Flooding of face masks and breathing system

Flooding of a separate face mask

Learn to dive without a face mask. Then flooding of the separate face mask is not a serious problem. To clear the face mask use the following procedure:

1. Tilt the head backward.
2. Hold the upper part of the face mask tight against the forehead.
3. Exhale through the nose (another reason why it might be well to avoid use of the noseclip) . Water will drain past the lower edge of the face mask.

Also, exhale through the nose occasionally to clear the face mask of small amounts of water. This procedure will also prevent face squeeze by equalizing pressure inside the face mask.

Flooding of a full face mask

Flooding of a full face mask is a serious problem, but a well-designed scuba with a full face mask has a means of overcoming it. The technique depends on the type of apparatus used. You should have pool experience in handling this problem before undertaking any scuba dives.

Flooding of the breathing system

The seriousness of flooding of the breathing system depends on the type of scuba you are using. In general, it is less of a problem in open-circuit scuba than in the closed systems. You should, however, be alert to the possibility that the cause of flooding, a cut or torn-loose breathing tube, may prevent successful clearing of the system. Also, you should know how to clear the breathing system of your scuba.

Exhaustion of the air supply

Running out of air is not a very serious situation unless the air-reserve mechanism has failed to function. Even if this happens, the increase in breathing resistance as the air pressure drops should give you ample warning of this condition.

When the breathing resistance becomes noticeable, open the air-reserve valve and start the ascent. If opening the air-reserve valve does not restore normal breathing, make an emergency ascent. During ascent from any depth, the reduction in water pressure provides at least a small amount of additional air, unless the failure is mechanical. Continue to breathe normally throughout the ascent, if possible. If not, exhale continuously throughout.

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