Which four actions are crucial in providing first aid for diving accidents?

The answer emphasizes critical components of first aid relevant to diving accidents. Maintaining basic life support is essential as it ensures that the diver's airway, breathing, and circulation are stable, which is a fundamental step in responding to any medical emergency. This can involve monitoring vital signs and being prepared to perform CPR if necessary.

Calling for help is paramount in any emergency situation, especially in diving incidents, where specialized medical care may be needed quickly. Promptly notifying emergency services can speed up the arrival of skilled assistance suited for underwater-related injuries.

Treating for shock is also a vital action because diving accidents can result in significant trauma or physiological changes, leading to shock. Addressing shock through appropriate positioning and keeping the individual warm is crucial to prevent further complications.

Lastly, delivering 100% oxygen is particularly important in cases where a diver may be experiencing decompression sickness or air embolism. Oxygen assists in mitigating the effects of nitrogen bubbles in the bloodstream and can significantly aid in the recovery process.

In contrast, the other choices either lack some of these critical actions or do not focus specifically on the unique requirements for diving accidents, which can involve more specialized responses due to the underwater environment and potential for different pathologies compared to other first aid scenarios.