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Why do deep sea divers or high altitude fliers wear special suits?
Humans are used to only a specific range of pressures. At sea level, we feel one atmosphere. But if we go higher up, the air is thinner, less dense, and has less pressure. When we go to the depths of the seas, we have many atmospheres, water is heavier and has way more pressure. At both these levels, humans cannot comforably move around, they could even get injured.
Pressure suits can help humans withstand different pressures by protecting us from the difference around us. Jet pilots can use pressure suits for high altitudes to apply pressure to different body parts (partial pressure suits) and astronauts will have pressure applied to the entire body (full pressure). Deep sea divers will have an atmospheric diving suit which block the heavy pressure of the water around them, and keep a decent pressure inside.
