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Gas embolism occurs independent of diving depth; it may occur in as little as 6 ft of water. It is frequently caused by a diver holding his breath during ascent. It may also result from an airway obstruction or other condition that prevents a diver from fully exhaling.
The primary sign of gas embolism is immediate loss of consciousness; it may or may not be accompanied by convulsions.
Source: The Gale Group. Gale Encyclopedia of Medicine, 3rd ed.";

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