What first steps should be taken if a diver is suspected of having decompression illness (DCI) after a dive with enriched air?

In the event that a diver is suspected of having decompression illness (DCI) after a dive with enriched air, contacting local emergency personnel is the most appropriate first step. This action is crucial because DCI can lead to serious complications that require immediate medical attention, often involving specialized treatment in a hyperbaric chamber. Emergency responders are trained to handle such scenarios and can ensure the diver receives the necessary assessment and care as quickly as possible.

While the other choices may seem beneficial, they do not prioritize the urgency or the complexities of DCI. Administering pain relief could mask symptoms and complicate medical evaluations, encouraging fluid intake might not address the immediate risks of DCI, and driving the diver to a hospital could introduce further risk, especially if the symptoms worsen or if the diver's condition deteriorates during transit. Thus, the best course of action is to secure professional medical assistance without delay.