Whales are adapted in amazing ways to cope with the pressure. For marine mammals, like whales, the situation is a bit different, as they breathe air like we do. This means that animals in the sea can stay safe when in the depths of the sea, as their body is balanced with the pressure around them, whereas we have air in our bodies that would be crushed. Water cannot be compressed, or squeezed, by pressure like air can. Many sea creatures are made of mostly water. Most ocean species, however, are specially adapted to live in the ocean. As the pressure is greater in the ocean, we have to use pressurised vehicles to travel down into the deep sea. Our human bodies - specifically our lungs - are only designed to manage one atmosphere’s worth of pressure (like we do on land). The deeper you go into the ocean, the more water there is above you, so there is more pressure. The water is heavier than air, and therefore puts more pressure on us and objects in the sea. In the ocean, however, we have this air but also water being pulled down by gravity. On land, we have the atmosphere pushing down on us, which we are designed to cope with. The short answer to this is because of the weight of the water being pulled down by gravity.
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