What should a diver do if they notice an unexpected rise in physical exertion while underwater?

When a diver experiences an unexpected rise in physical exertion underwater, the appropriate response is to monitor their condition closely and be prepared to ascend if any concerning symptoms develop. This is crucial because increased physical exertion can lead to fatigue, potential overexertion, or even hint at developing issues like oxygen toxicity or decompression sickness.

By monitoring their physical state, the diver can ascertain if symptoms such as shortness of breath, dizziness, or unusual fatigue are appearing. If such symptoms begin to manifest, ascending to a shallower depth, where pressure changes are less extreme, becomes a priority to mitigate risks associated with deep water and exertion. This proactive approach maintains safety and promotes a prudent decision-making process while diving.

While resting and taking breaks could be beneficial to alleviate immediate fatigue, it does not address the potential for developing severe symptoms that may require immediate action. Continuing the dive could expose the diver to greater risk, and notifying others is important in diving safety, but without addressing one's own physical condition first, it may not be the most effective immediate course of action. Thus, monitoring one's situation and being ready to ascend is a sound approach to preventing complications in a diving context.