What is a key symptom of hypothermia that indicates a diver should end their dive?

In the context of diving and potential hypothermia, shivering serves as a key symptom that indicates a diver should consider ending their dive. Shivering is the body's natural response to cold exposure, acting as a mechanism to generate heat. If a diver experiences persistent shivering, it suggests that their core body temperature is dropping significantly, and continuing the dive could lead to a worsening condition.

Furthermore, shivering can impair a diver's ability to function properly underwater. As hypothermia intensifies, cognitive and physical performance can deteriorate, increasing the risk of accidents and making it more difficult to respond to emergencies.

While persistent coughing, excessive fatigue, and increased heart rate may also be notable symptoms in various diving scenarios, they do not specifically signify a critical condition related to cold exposure in the same way that shivering does. Therefore, the presence of shivering is a clear indication for divers to end their dive promptly, seek warmth, and prevent further risk of hypothermia.