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Technical Wreck Diver




• This course is to provide the diver with the skills and knowledge needed to gain experience and minimize risks in penetration wreck diving at depths beyond 130 fsw (40 msw). (This course may be combined with the Decompression Techniques Course. The resulting course would require fourteen dives for





Upon successful completion of this course, graduates are considered competent to plan and execute penetration wreck dives that require stage decompression and utilize air and EANx

and/or oxygen for stage decompression without direct supervision, provided the diving activities and the areas dived approximate those of training.




Open water supervision


• A maximum of four students per active NAUI Instructor is

allowed. Assistants with specific technical diving experience

are strongly recommended but do not increase the student-to-instructor





• Minimum age of 21.

• Minimum certification as a Penetration Wreck Diver with at least 10 logged penetration wreck dives. Minimum of 50 logged dives total.

• Certification in Technical NAUI EANx and Decompression Techniques.




• Classroom hours – eight are estimated

• Open water dives – eight

• The maximum depth in this program may not exceed 165 fsw (50 msw).




The following equipment is required for each student in addition to that required by ”Policies Applying to All NAUI Diving Certification Courses – Equipment:

• Depth gauge, compass and timing device or dive computer.

• Dive knife/tool, emergency signaling device, slate and pencil.

• Cylinders and regulators properly labeled and cleaned as required for breathing gas mixtures involved with a separate submersible pressure gauge for each cylinder used. Also, for primary cylinder(s), cylinder volumes appropriate for the planned dives and all students” breathing gas consumption rates. Cylinders are to be equipped with dual outlet valve or manifold; isolator valve is recommended. The decompression mix cylinder(s) and cylinder volume must be appropriate for the planned dives and student breathing gas consumption rates and equipped with a submersible pressure gauge and prepared for back mount or for side-or front-mounting to a harness using clips. Primary and primary redundant regulator(s) are required on all primary cylinders. A five foot (1.5 meter) or longer second stage hose should be designated and prepared

for emergency air sharing.

• Oxygen analyzer (may be provided or rented for use during the course).

• Redundant Depth and Timing Devices

• Air and EANx dive computers are allowed for use as depth and timing devices and for dive planning. Note: Because of a proliferation of decompression algorithms utilized in dive computers,

the instructor”s choice of a standard dive table profile, e.g., DCIEM, USN, Buhlmann or software-generated proprietary decompression table is preferred over the use of a particular dive computer for decompression.

• Ascent line reel attached to lift bag and biodegradable Jersey up line that is adequate for maximum planned depth and with a minimum of 50 lb. (23 kg.) lift and additional personal lines as needed

• Redundant underwater lights, minimum of three

• A minimum of two line cutting devices

• Line reels (for penetration technique) including primary penetration reel and safety reel

• Additional optional student diver equipment as required

• Waterproof dive tables

• A redundant breathing gas system with a separate submersible pressure gauge for each cylinder used and adequate gas supply for planned dives considering reserves, gas supply loss

scenarios, and decompression obligation.




The students are to analyze their own breathing gas mixture and to plan and safely execute each dive. Dive planning shall include limits based on gas consumption, oxygen toxicity exposures

and inert gas absorption for each dive and breathing gas mixture. Each diver is to demonstrate switching and isolating a malfunctioning regulator, out of air sharing with five foot ( 1.5 meter) or longer hose through a restriction, locating a lost penetration line, silt-out/black-water procedures, under-water navigation appropriate to the dive plan, deployment of lift bag or biodegradable Jersey up line for stage decompression. Students shall participate in a diver rescue simulation

to include management of a diver experiencing underwater convulsions.

O Technical Wreck Diver O



• Applied Sciences. This is a review and continuation of the material covered in the NAUI Master Scuba Diver and Technical EANx Diver courses. Included are physics, physiology and medical aspects as applied to planned decompression diving, with special emphasis on mechanisms of bubble formation, a review of deep stop models and theory, inert gas perfusion and diffusion, equivalent narcosis depth (END), ad-vantages of oxygen enriched air mixes for decompression, oxygen toxicity, (whole body and CNS otu”s/uptd”s), hypoxia, nitrogen narcosis, tissue inert gas tension, inspired inert gas tension, ”precautionary stops” compared to required stops, rates

for ascent/descent, carbon dioxide toxicity, carbon monoxide toxicity, hyperthermia, hypothermia, psychological considerations: task loading, stress, perceptual narrowing, dive time management, panic, (remediation of specific subject knowledge as needed). Also to be covered are propulsion techniques, i.e., anti-silting, best mix and maximum operating depth mixture computations plus decompression options using EANx and oxygen and the need for five minute air breaks every 20 minutes during stage decompression and the off-phenomenon when using 100% oxygen.

• Technical Wreck Dive Planning. Coverage is to include redundant equipment configurations, also, exposure suits, coveralls, tools and the types and utilization of penetration lines. Dive procedures including self sufficiency, search patterns, equipment management, correct ballasting and buoyancy control, advance preparation for penetration, progressive penetration as compared to line penetration, penetration and considerations for confined space and options for exit. The risks and hazards associated with penetration wreck diving including vertigo and disorientation, silt-outs/black water, entrapment and entanglement, cave-in, sharp and jagged objects, loss of

breathing gas, loss of penetration line or direction relative to exit, loss of dive team integrity. Also shipwreck location and identification, archival research, federal, state and local regulations,

information sources, types and use of hydraulic, pneumatic hand and cutting tools, archeological surveying techniques, historical preservation considerations. Additionally, contingency planning, recompression chamber locations and evacuation procedures, communication and the availability and use of emergency breathing gases.

O Technical Wreck Diver O

Enrollment Form


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