Deep sea fish don’t have these air sacs in their bodies, which means they don’t get crushed. This is because they contain air: that feeling comes from the air sacs in your body being squashed by the pressure of the water.įish living closer to the surface of the ocean may have a swim bladder – that’s a large organ with air in it, which helps them float up or sink down in the water. When you dive to the bottom of a deep swimming pool, you might start getting a painful or unpleasant feeling in your ears and sinuses. At Challenger Deep in the Mariana Trench – the very deepest part of all the world’s oceans – the pressure may be 1,000 bars or more.īut the creatures that live in the deepest parts of the ocean have special features, which help them deal with these tough conditions – including the crushing pressure. In the deepest part of the Atlantic, the pressure can be 840 bars – that’s about 840 times the pressure we experience at sea level.
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