Which item is critical to have ready when assisting an unresponsive diver?

Having an emergency oxygen tank ready when assisting an unresponsive diver is crucial because oxygen is vital in a drowning or near-drowning scenario. An unresponsive diver may be experiencing hypoxia, which is a lack of oxygen in their tissues. Administering oxygen can significantly improve their chances of recovery by ensuring that they receive the necessary oxygen to stabilize their condition.

When a diver is unresponsive, time is of the essence, and the immediate priority is to provide support and restore breathing if they are not breathing on their own. An emergency oxygen tank allows for rapid delivery of oxygen, minimizing the potential damage to vital organs and improving overall outcomes.

While other items such as a life jacket, whistle for signaling, and first aid kit can be beneficial in various situations, none are as critical in the immediate response to an unresponsive diver as having an oxygen supply readily available. Being equipped to deliver supplemental oxygen can be a lifesaving intervention in the context of underwater emergencies.