Hand signal, waving your arms at the surface: Distress, help. Hand signal, end of the index finger and end of the thumb meets: OK? OK. Hand signal, a palm facing down and fingers spread and thumb moves up and down: Something wrong. Hand signal, a palm facing forward and fingers closed to each other: Stop, hold it, stay there. You know you are properly weighted for diving if you: Float at eye level holding a normal breath of air with an empty BCD. As you descend (go down) towards the bottom, your wet suit will: Compress (become smaller in thickness) from water pressure and you will lose bouyancy and warmth the deeper you go. If you work too hard and find it difficult to breath underwater, you should: Stop all activity and rest, hold onto something for support if possible. Sound How should you move under water? Slowly and steadily. This is why you cannot use it to tell direction very well. than when you look at them on the surface. When you look at things underwater they often seem. What can you do to properly care for a scuba tank? Do not use all the air in the tank.
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