Options:
A ascend using my buddy's alternate air source / make a controlled emergency swimming ascent
B ascend using my buddy's alternate air source / make an buoyant emergency ascent
C make a normal ascent / ascend using my buddy's alternate air source
D make a controlled emergency swimming ascent / make a normal ascent
Answer:
Ascend using my buddy's alternate air source / make a controlled emergency swimming ascent is the best option if I'm in shallow water and the surface is closer than my buddy. Thus, the correct option is A.
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What is CESA?</h3>
An emergency swimming ascent that is controlled, executed at a safe ascent rate, and continuously exhaled at a rate that is unlikely to injure the diver by causing lung overexpansion is known as a controlled emergency swimming ascent (CESA).
First, don't panic and start looking for your partner if you discover that you are running out of air while submerged. You must do an emergency ascent if you are unable to accomplish that. Make a controlled emergency swimming ascent first (CESA). This ascent is being made safely and remains under control. The air in your lungs will expand when the atmospheric pressure decreases as you ascend. Always exhale a continuous stream of bubbles as you ascend to prevent an overpressurization injury.
The sole choice is to convert the CESA into a buoyant emergency ascent if you are unsure that you will make it to the surface in time to breathe. As you ascend, locate your weight system to be prepared. Additionally, take the weight out of one of your weight pockets and hold it away from your body in case you need to drop it. Dropping the weight will cause you to experience an upward buoyant force, which is an uncontrollable emergency ascension. This maneuver should only be used as a last resort.
In light of this, you should always check your SPG first. Then, if you run out of air, try to find your companion. If they can't be located, perform a CESA. The last resort is a buoyant emergency ascent.
For more information regarding CESA, visit:
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