Shallow Water Blackout
Preventing Shallow Water Blackout
The best prevention against shallow water blackout is to avoid excessive hyperventilation. Limit yourself to two or three breaths, then take and hold a final breath before the skin dive.

Like scuba diving, skin diving should always be performed with a buddy. But unlike scuba diving, skin divers take turns diving below the surface while the other remains at the surface. This ensures that help will be available in the event a blackout occurs.

Finally, avoid deep skin dives, and always keep track of the time you've spent underwater. Many skin divers have become preoccupied with the life they see while underwater, and completely forget to surface for a breath of air before it's too late.