Thermal protection - water at depth can be very cold.
Wiki User
∙ 11y agoBoth 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.
Free divers do but scuba divers do not need to. Scuba divers take their air with them and would have no need to hyperventilate.
they need to know how long they can be underwater, and how deep they can go with the air in the tank.
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].
containers, space suits,
Because fish have gills,giving them the ability to breath under water and divers dont.
We need air to breath. Otherwise we would suffocate and die. That is why scuba divers have special equipment to allow them to have air to breath underwater.
If the space station is pressurized, I don't think astronauts need to where space suits.
they need protection from stuff
They need to know how to swim away from sharks and such!