What is a diver's first response when they experience an out-of-air situation?

In an out-of-air situation, a diver's first response should prioritize safety and controlled ascent. The correct answer emphasizes the importance of a controlled swimming ascent as an immediate action. This response aims to prevent rapid ascents that could lead to barotrauma or decompression sickness.

When a diver realizes they are out of air, they should remain calm and begin ascending slowly while monitoring for any potential hazards such as rapid ascent rates or the need to equalize pressure in their ears. A controlled ascent allows the diver to maintain awareness of their underwater environment and manage their ascent rate, typically no faster than the recommended pace of about 30 feet per minute, depending on depth and specific training recommendations.

While signaling for help and utilizing an alternate air source are crucial actions, they are typically not the immediate response action while ascending to the surface, as the primary focus must be on maintaining a safe ascent. Releasing weights might be considered in some situations, especially if a diver needs to consider buoyancy, but it is generally secondary to initially initiating a controlled ascent. Hence, the correct response centers on ensuring safety through controlled movement towards the surface, which is essential in handling an out-of-air emergency holistically.