What should you do if a diver is struggling and cannot swim against the current?

When a diver is struggling against a current, signaling them to stop and rest is crucial for their safety and well-being. In a strong current, continuing to struggle can lead to exhaustion, panic, and even drowning. By instructing the diver to stop, you allow them to conserve energy and regain their composure. This pause can give them the opportunity to assess their situation and breathe, reducing stress and helping them to think more clearly.

Resting can also prevent further fatigue and decrease the risk of them becoming a rescue situation themselves. Once they have calmed down, you can then provide assistance, such as helping them find a safe place to hold onto or guiding them to swim in a more favorable direction.

The other options, while potentially well-intentioned, do not prioritize the diver's immediate need for rest in a challenging environment. Encouraging them to keep trying might lead to increased exhaustion, while calling for emergency help might not be necessary if the diver is able to be reassured and assisted effectively.