When does loss of consciousness most often occur during which stage of cold water?

Loss of consciousness most often occurs during the "cold shock" response, which typically happens within the first few minutes of sudden immersion in cold water. This stage is characterized by gasping, hyperventilation, and potential cardiac issues due to the cold temperature. The body's immediate reaction can lead to drowning if individuals are unprepared. Prolonged exposure may lead to hypothermia, which can also contribute to loss of consciousness later on.