避免体温过低。 当心鲨鱼。 寻找陆地。 制作饮用水。 发送求救信号。

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Next to drowning, hypothermia is the biggest threat to your survivor after a shipwreck. This is because exposure to cold water will lower your body temperature. If your body temperature gets too low, your body will eventually shut down and you will die.  If you’re in the water with a flotation device and not on a raft, hug your knees to your chest. This will help maintain body warmth. If you’re with others in the water or in a raft, stay close together, and hug each other. Keep your clothes on.