breath without life support. :)
Slowly
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.
Scuba divers who surface too quickly after a deep dive are prone to decompression sickness.
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
Divers (and others) call the compressed air cylinders used by divers tank(s) or SCUBA tank(s).
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