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The Dangers of Swimming Underwater

This article describes why swimming underwater, while it may sound like a lot of fun, can in fact be dangerous or even life-threatening and is best avoided.

A drowning man

Swimming Underwater can have dire consequences.

Let’s be honest, as a child everyone has at least once played the game with his friends about who could hold his breath underwater for the longest time or who could swim underwater the farthest.

While these activities may look like harmless children’s games, they are in fact dangerous because they can at first lead to shallow water blackout and subsequently to drowning.

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Shallow Water Blackout

Shallow Water Blackout happens when a swimmer or diver faints in shallow water, which is less than 16 feet (5 meters) deep.

Typically the victim hyperventilates before diving or swimming underwater, then dives or swims while holding her breath. This leads to fainting underwater due to low oxygen levels in the bloodstream.

Why does this happen? In fact, the urge to breathe is driven by the level of CO2 (carbon dioxide) in the bloodstream. However, if you hyperventilate, the CO2 is flushed from the bloodstream to a very low level. The urge to breathe will then kick in much later than if you didn’t hyperventilate.

So if you do hyperventilate before you dive or swim underwater, what can happen is that the oxygen stored in the body is consumed before the level of CO2 in the bloodstream rises high enough to trigger the urge to breathe. You then blackout without any warning signs.

What makes this problem worse is that from the water surface, it often looks like there isn’t any problem. The victim didn’t make any warning signs or may even still be moving unconsciously.

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Conclusion

As we have seen, diving or swimming underwater while holding your breath is dangerous, especially if you do hyperventilate before. This explains why these activities are forbidden in a number of public swimming pools. Sadly, the general population is not yet well aware of this danger and still needs to be educated.

It is best to avoid these activities at all. However, there are cases where you need to dive or swim underwater while holding your breath, for example to pass certain certifications.

In that case, you should always practice under the supervision of a lifeguard or friend that knows CPR (Cardiopulmonary resuscitation) and avoid hyperventilation before you dive or swim underwater.

Additional Information

Also see this site dedicated to Shallow Water Blackout Prevention


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