Life under the sea is very different from on land. It is difficult for people to see, hear and move well under the water.
Unlike fish, people cannot obtain oxygen directly from water. Instead, they need to carry oxygen tanks with them.
People need to be healthy and in good shape to stay underwater for a long time. Their hearts, ears and lungs must be strong, since these are the organs that suffer the most underwater.
People need special equipment for underwater diving such as a diving mask, fins, a wetsuit, a weight belt, a compressed air cylinder and some goggles.
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