Which stage of cold-water exposure is defined by cold incapacitation when water is at freezing temperature, typically causing incapacitation in 5–15 minutes?

• A. Stage 1: Cold Water Shock
• B. Stage 2: Cold Incapacitation
• C. Stage 3: Hypothermia
• D. Stage 4: Circum-Rescue Collapse

Answer: (B)

Cold incapacitation is the stage being described. When water is at freezing temperature, the body's muscles and nervous system lose function quickly, so a person can become unable to move or think clearly within about 5–15 minutes. This is different from cold water shock, which happens immediately on immersion and causes gasping and hyperventilation; and from hypothermia, which develops later as core body temperature drops and leads to shivering, slowed thinking, and eventually unconsciousness. There’s also circum-rescue collapse, a risk during rescue attempts. The 5–15 minute incapacitation window at near-freezing water specifically points to Cold Incapacitation.