Unit of competency Outline

Date retreived
24/07/2026 12:53 AM AWST

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Dive using closed-circuit breathing apparatus (O2) in open water to a maximum depth of 10 metres

Dive using closed-circuit breathing apparatus (O2) in open water to a maximum depth of 10 metres

Unit of competency
National Code
DEFDV006B
State Code
AVV07
TGA Status
Replaced
DTWD Status
Replaced
Current Release Number
2.00
Current Release Date
24/01/2013
View on TGA
State Implementation and Classification
Approved Date
Field of Education
092101 - Sport And Recreation Activities
Original Release Date
Nominal Hours
0
Description
This unit covers the competency required to dive using closed circuit breathing apparatus (CCBA) (O2) in an open water environment to a maximum depth of 10 metres.This unit of specifically covers those aspects of performance unique to CCBA (O2), such as operating the oxygen compressor/hand-booster pump, inspecting and operating CCBA (O2) equipment, and conducting CCBA (O2) specific contingency drills.
Notes
Elements and Performance Criteria
1. Operate an oxygen compressor/hand-booster pump
  • 1.1 Compressor and associated equipment are inspected for serviceability.
  • 1.2 Protective equipment is fitted.
  • 1.3 Leads and hoses are connected to the compressor.
  • 1.4 Gas cylinders are charged to maximum working pressure and details are recorded in relevant logs.
  • 1.5 Operator level maintenance is performed on the compressor.
  • 1.6 Compressor is de-serviced after use.
2. Conduct dive operations
  • 2.1 CCBA (O2) is selected, inspected for serviceability, and fitted and tested (both out of water and in-water).
  • 2.2 Dives are conducted using CCBA (O2) and dive contingencies are demonstrated.
  • 2.3 CCBA (O2) is de-serviced and defects are reported in accordance with organisational procedures.
The Range Statement relates to the Unit of Competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording in the Performance Criteria is detailed below.
Open water environment may include:
day or night
oceans, seas, lakes and rivers
subsurface conditions:
current (0-2 knots)
visibility (0 metre +)
temperature (0 degrees +)
surface and subsurface hazards such as:
anchor drop zones
cathodic protection devices
electrical cabling
inlets and sonar/radio frequency hazards
marine animals
piers and jetties
pipelines
pollutants
propellers/thrusters
trapping hazards:
beams
culverts
gates
grottoes and caves
intakes and outfalls
nets
safety, anchor and communications lines
sewers
submerged ships, vehicles and structures
sluices
vessel rocking and associated movement
Associated equipment includes:
hoses
pumps
Protective equipment may include:
gloves
goggles
Operator level maintenance includes:
checking existing pressure in cylinders with pressure gauge
conducting charging in (O2) clean environment
following correct charging procedure and charging rate
operating high pressure charging panels
CCBA (O2) includes:
counter-lung
emergency cylinder
facemask/mouthpiece
oxygen cylinder
scrubber material
Dive contingencies include:
air supply stoppage
buddy breathing
companion diver
flooded mask
fouled supply
hose blockage/choking
hose Rupture
set to 35 bar
Critical aspects for assessment and evidence required to demonstrate competency in this unit
Assessment must confirm the ability to:
prepare equipment for the dive including charging cylinders
arrange for others to check equipment
maintain equipment during the dive
refurbish equipment postdive
handle nonfunctional equipment items
safely enter and exit the water appropriate to the launch platform, equipment and conditions
conduct inwater checks
recover and clear mask and mouthpiece
switch from primary to the reserve air system
implement contingency and emergency drills such as:
ditching drills
buddy breathing
unconscious companion diver drills.
Consistency in performance
Competency will be demonstrated over a minimum of 30 dives with the diver diving to a depth not greater than 10 m using CCBA (O2) in open water that includes the following requirements:
oceans, seas, lakes and rivers
day and night
subsurface conditions:
current (0-2 knots)
visibility (0 metre +)
temperature (0 degrees +)
a range of surface and subsurface hazards.
Table 1 (below) outlines the minimum dives required by this Unit of Competency.

Table 1
Condition
No of Dives
Inwater time
Remarks
Between 010 m
30
1 200 min
Total accrued sub-surface time (010 m)
Special Qualifiers (included within above)
Night 010 m
10
400 min


Context of and specific resources for assessment
Context of assessment
Competency will be assessed in the ocean over a range of oceanic, diurnal and nocturnal environments, supported by questioning on shore or aboard vessels.
When practicable, assessment should relate to the diver’s vocational focus.
Specific resources for assessment
Access to complete range of CCBA (O2) diving, safety and accessory equipment.
No information