What is a Controlled Emergency Swimming Ascent (CESA)?

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A Controlled Emergency Swimming Ascent (CESA) refers to a specific technique designed for divers who find themselves in a situation where they are low on air or out of air while submerged. This technique involves a slow and controlled ascent to the surface while continuing to exhale to prevent lung over-expansion. It is a critical safety skill that divers are trained to execute in order to prevent the risks associated with a rapid ascent, such as decompression sickness or barotrauma.

The CESA emphasizes the importance of maintaining a steady ascent rate and managing buoyancy effectively while still under the water. This method provides divers with a means to safely return to the surface when faced with an emergency scenario, demonstrating the importance of understanding proper ascent techniques in the event of an unexpected air supply failure.