for protection, as astronauts need to wear space suits to do space walks. Humans are fragile beings. Our skeletons and bone structure can only work in a narrow range of pressure around the atmospheric pressure [~1x105 Pa at sea level] -- we have adapted to earth's atmosphere. In deep seas, the human body will encounter a pressure [Pa], in addition to atmospheric pressure, equals to rho*g*h, where rho = water density [~ 1000 kg/m3]; g = 9.8 [m/s2]; and h is the water depth [m].
Deep sea divers wear special suits to keep their body from getting too cold. They also wear these suits to keep from being crushed under the pressure.
Thermal protection - water at depth can be very cold.
Both astronauts and sea divers wear special sits because they travel into atmospheres that are strange to our bodies. Our bodies were not built to stand extremely deep waters and outer space. The suits protect them as they go about their business in those places.
Deep sea divers wear diving suits to protect themselves from the cold temperatures, high pressure, and potential hazards of the deep sea environment. The suits help to regulate body temperature, provide buoyancy, and offer protection from sharp objects and marine life.
Deep diving in the ocean is done very carefully in special suits and helmets. Pressure under the ocean is significant and can be immense by the time you are down a few hundred feet. Scuba diving is sometimes used commercially, but only to depths of about 120 feet. - Many large dockyards and navies employ 'clearance divers ' to repair items on the bottom of ships and work on the dockyard floor. These divers wear heavy canvas suits and large hard helmets, fed air by lines from the surface. They can work down to 300 feet deep or so. Research and oilfield divers can wear special hard suits that allow them to go down almost 1,000 ft. These divers often wear "Newt suits" made by the Canadian company Nuytco Research in Vancouver.
To withstand the pressure of being under water.
To withstand the pressure of being under water.
Diver Suits
Scuba divers do not wear heavy metal suits. Perhaps you are referring to the bulky looking Mark 5 dive gear with the large helmet and the breast plate that weighs 64 pounds. Suit weighs 25 lbs. Each shoe weighs 25 lbs. Oh, the weight belt the diver wears is 60 to 80 lbs. All this weight is needed to get the diver to sink from all the air inside the helmet.
What they wear depends on what events they are competing in. Most athletes wear modern athletic attire that can include warm up suits, shorts and tanks.
To show-off.
the woman wear cheong-sams a skirt and the men wear suits