What should divers do before performing an emergency ascent?

Before performing an emergency ascent, divers should always assess the situation and plan accordingly. This step is essential because it allows them to evaluate the specifics of the emergency, such as their remaining air supply, depth, and any potential hazards in the water. By understanding the circumstances, divers can make informed decisions about the safest way to ascend.

Planning can include choosing a preferred path to the surface, determining if a controlled ascent is possible, and whether a safety stop is feasible. It also involves recognizing whether they might be putting themselves or others at risk by ascending too quickly or without proper precautions. This thoughtful approach directly contributes to safety and helps to mitigate the risks associated with a rapid ascent, such as barotrauma or decompression sickness.

In contrast to this thoughtful assessment, other actions like panicking or ascending immediately without a plan can lead to dangerous outcomes. Checking the depth gauge is important but falls under the broader category of situational awareness that should occur during the assessment. Similarly, while signaling for help could be part of an emergency response, it should not replace the primary focus on understanding the emergency and planning the ascent appropriately.