The certification levels for PADI (Professional Association of Dive Instructors) are as follows:
*Junior Open Water Diver---minimum age of 10 and the diver cannot go below 45 feet
*Basic Open Water Certification--minimum age of 12 and the diver can go to the safe distance of 132 feet
*Advanced Open Water Certification--minimum age of 15
*Rescue Diver--minimum age of 18
*Divemaster
*Scuba Instructor--the diver is licensed to certify other divers.
There are also many specialty courses that one can take, such as wreck diving, deep diving, nitrox diving, search and recovery, and underwater Photography.
300 feet
about 10 metres/30 feet most of the time but deep sea divers can go to depths of about 30 metres/90 feet
The collective noun is a bubble of scuba divers.
40feet (12m)
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.
seebees
They swim
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