Commercial diving/Basic design, use and operating principles of diving equipment

Relevance: Scuba diving, Surface supplied diving, Surface oriented wet bell diving.

Required outcomes:
 * 1) Identify and describe the function, selection, adjustment for personal use, pre-use inspection, care and maintenance of all personal dive equipment
 * 2) Describe the identification, function, selection, pre-use inspection and testing, care and maintenance of scuba equipment. Explain the operation of regulator first and second stages, submersible pressure gauges, half masks, full-face masks and bailout sets (emergency gas supply)
 * 3) Discuss the surface supplied breathing apparatus options and their correct use, handling and care, explain the functions and application of lightweight demand helmets, free-flow helmets, band-masks, full-face masks and bailout sets
 * 4) Describe the handling, management and care of the diver’s umbilical
 * 5) Describe the SSDE surface gas supply and panel components and sub-assemblies and the applications and limitations of the system
 * 6) Describe the principles, applications and limitations of scuba replacement
 * 7) Describe the operating principle of the basic types of rebreather scuba and their applications and limitations