Explainer Hub on Instagram: "The night the Titanic sank, the ocean temperature was close to freezing point. When a human body enters such cold water, the muscles tighten instantly, breathing becomes uncontrolled, and the heart is placed under extreme stress. This sudden reaction is called cold shock. Within a few minutes, the body begins to lose heat rapidly. Hands stop working, legs grow weak, and swimming becomes almost impossible. Many victims didn’t drown because of exhaustion — they lost co