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TDI – Semi-Closed Circuit Rebreather Diver Course, Unit Specific- ATLANTIS, DOLPHIN, RAY
Introduction
This is the entry-level certification course for recreational divers wishing to utilize the Draeger Nitrox semi-closed circuit Rebreathers. The objective of this course is to train recreational divers in the benefits, hazards and proper procedures for using any of the Draeger SCR Rebreather Series.

Qualifications of Graduates
Upon successful completion of this course, graduates may engage in diving activities utilizing the Atlantis I Rebreather / Dolphin I to a maximum depth of forty (40) msw / one hundred thirty (130) fsw, or twenty two (22) msw / seventy two (72) fsw if trained on the Ray.

Who May Teach
Who may teach this course:
1. Any active TDI Rebreather Instructor may teach this course.

Student – Instructor Ratio
Academic:
1. Unlimited, so long as adequate facility, supplies and time are provided to insure comprehensive and complete training.
Confined Water (Swimming pool-like conditions):
1. N/A.
Open Water (Ocean, lake, quarry, spring, river or estuary):
1. A maximum of six (6) students per Instructor. However, it is the instructor’s discretion to reduce this number as conditions dictate.

Student Pre-Requisites
The student must:
1. Be a minimum age of fifteen (15).
2. Have a minimum certification of TDI Nitrox Diver (may be combined in program), or equivalent at the discretion of the instructor.

Course Structure and Duration
Open Water Execution:
1. Four (4) dives with a minimum of one hundred (100) accumulated minutes.
Course Structure:
1. TDI allows instructors to structure courses according to the number of students participating and their skill level.
Duration:
1. The minimum number of classroom and briefing hours is six (6).

Administrative Requirements
The following is the administrative tasks:
1. Collect the course fees from all the students.
2. Ensure that the students have the required equipment.
3. Communicate the training schedule to the students.
5. Have the students complete the Liability Release and Medical history forms.
6. The Instructor should review the Liability Release and Medical Forms before starting on the course.
Upon successful completion of the course the Instructor must:
1. Complete the Student Registration Form and send the Registration Form to TDI HQ.
2. Award card and certificate.

Required Equipment
The following are required for this course:
1. TDI Rebreather Manual.
2. TDI Rebreather Overheads / PowerPoint Presentation.
The following equipment is required for each student:
1. Mask and fins.
2. Exposure suit adequate for the open water environment.
3. Access to oxygen analyzer (instructor may supply).
4. Adequate weight.
5. Bailout cylinder (minimum three hundred seventy (370) liter / twelve (12) cu. ft.) and regulator along with low-pressure inflation hose (except if using the Ray).

Required Subject Areas
The Rebreather Manual and the manufactures’ manual is mandatory for use during this course but instructors may use any additional text or materials that they feel help present these topics. The following topics must be covered during this course:
1. History and Evolution of Rebreathers.
2. Comparison of Open Circuit, Closed Circuit, and Semi-closed Circuit.
3. Practical Mechanics of the System
A. Assembly and disassembly of the Rebreather.
B. Layout and design.
C. Scrubber recharge.
D. System maintenance.
E. Breathing loop decontamination procedures.
4. Gas physiology
A. Oxygen toxicity.
B. Nitrogen absorption.
C. CO2 toxicity.
D. Gas consumption.
5. Formula Work
A. 02 metabolizing calculations.
B. Inspired 02 calculations (Rebreather Equation).
C. Equivalent air depth.
6. Dive Tables
A. Inspired 02 table.
B. Equivalent air depth.
7. Dive Computers
A. Mix adjustable.
B. 02 integrated.
8. Dive Planning
A. Operational Planning
I. Gas requirements.
II. Oxygen limitations.
III. Nitrogen limitations.

Required Skill Performance And Graduation Requirements
The dive depth shall not exceed one point six (1.6) ATA P02. The following open water skills must be completed by the student during open water dives:
1. Properly analyze gas mixture.
2. Demonstrate adequate pre-dive planning
A. Limits based on system performance.
B. Limits based upon oxygen exposures at planned depth with mix.
C. Limits based upon nitrogen absorption at planned depth with mix.
3. Properly execute the planned dive within all pre-determined limits.
4. Diver will demonstrate actual safety stops at pre-determined depths.
5. Properly execute a recovery from a system failure and switch to bail-out.
6. Properly execute the breakdown and maintenance of the Rebreather.
In order to complete this course, students must:
1. Satisfactorily complete the TDI Rebreather Course written examination.
2. Complete all open water requirements safely and efficiently.
3. Demonstrate mature, sound judgment concerning dive planning and execution.
Updated 24 May 2003