As body heat is lost, divers may become insensible to what?

When a diver loses body heat, the body's physiological response includes a decrease in sensory perception, particularly in the area of pain. As the body cools, nerve endings can become less sensitive, meaning that the diver may not feel discomfort or pain as acutely as they would under normal temperature conditions. This insensitivity can lead to potentially dangerous situations, as the diver may not recognize the severity of frostbite, reef cuts, or other injuries sustained while diving in cold water.

The other options, while related to the diving experience, do not accurately reflect the primary sensory change associated with cold exposure. Temperature changes are still detectable; divers typically feel cold regardless of their diminished awareness of pain. Sound can be perceived, although it may be altered underwater due to density differences in water compared to air. Pressure, particularly during descent and ascent, remains a critical physical sensation that divers are acutely aware of and need to manage carefully to prevent injury.