You sweat in a wetsuit. You cannot replace that lost liquid while underwater easily.
Addition
Scuba cylinders are filled with very dry gas to prevent mositure from accumulating in them. Since the gas is very dry, your lungs will humidify the air you breath using your body's own moisture supply. Because you are humidifying the air from water within your own body, you lose moisture when you exhale and therefore you lose moisture due to breathing the dry air from the scuba cylinder and become dehydrated during a dive. On a side note, it is very important to stay hydrated since dehydration is a contributing factor to decompression sickness.
The collective noun is a bubble of scuba divers.
scuba divers
Many people use a SCUBA suit for diving. Sport divers, police divers and some Navy recovery divers.
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 swim
seebees
In the Water....
Scuba - self contained underwater breathing apparatus
Scuba Bob's Ocean Quest - 2006 Fearless Divers Scuba Rangers 2-7 was released on: USA: 2007
Scuba regulators, also called 'diving regulators', are vital for scuba divers to properly obtain oxygen from a tank. Regulators are available for purchase through diving specialty stores such as Prime Scuba, House of Scuba, and Divers Direct.
Skin divers are people who dive into the ocean without using special equipment, unlike Scuba divers.
Like all adults or older teenagers; scuba divers need English and Maths also physics and scuba diving training. Hope I answered your question xx