Scuba - self contained underwater breathing apparatus
They don't breathe normally on their own.They have to use pressure regulators to breathe naturally, overcoming the extreme pressure deep underwater.A snorkel and oxygen tank help the divers breathe when they are underwater.
You can breathe underground by using submersible breathing aparatus similar to scuba gear used by divers.
By oxygen tanks - similar to SCUBA divers.
Many people use a SCUBA suit for diving. Sport divers, police divers and some Navy recovery divers.
The collective noun is a bubble of scuba divers.
water proof ones
scuba divers use pressure meter because the deeper down you go the more pressure builds upAdditiona depth gauge or a dive computer
Because fish have gills and can breathe under water and humans do not
scuba divers
Scuba Divers use a Sonar to find treasure or a hidden ship.
they use an air tank they put a mouth piece in there mouth and breath through it i know this because i went diving before oh and one last thing you have to keep an eye on how much air you have
Free divers do but scuba divers do not need to. Scuba divers take their air with them and would have no need to hyperventilate.