Technical Diver Level 2
GUE’s Technical Diver 2 course is designed to enhance deep diving proficiency while using helium breathing gasses and oxygen-enriched decompression gasses. Other course outcomes include: the use of multiple stages; the use of Trimix with greater percentages of helium; gas management; oxygen management; extended decompression; accelerated, omitted and general decompression strategies; dive planning; and management of multiple cylinders.
Applicants for a Tech 2 course must:
Submit a completed registration form, a medical history, and a liability release to GUE Headquarters.
Be physically and mentally fit.
Hold insurance that will cover diving emergencies such as hyperbaric treatment, e.g.
DAN Master-level insurance or equivalent.
Be a nonsmoker.
Obtain a physician’s prior written authorization for the use of prescription drugs, except
for birth control, or for any prior medical condition that may pose a risk while diving.
Be a minimum of 18 years of age.
Be a certified GUE Tech 1 level diver.
Must have a minimum of 25 dives beyond Technical Diver Level 1 certification; at least
fifty dives on double tanks and at least 25 should utilize a decompression cylinder.
184.108.40.206 Course Content
The Tech 2 course is normally conducted over six days; it requires seven dives and a minimum 40 hours of instruction, encompassing classroom, land drills and in-water work.
220.127.116.11 Technical Diver Level 2 Specific Training Standards
Student-to-instructor ratio is not to exceed 6:1 during land drill or surface exercises, but cannot exceed 3:1 during any direct in-water training.
Maximum depth 250 feet/75 meters.
Dives should not be planned to incur more than 60 minutes of decompression time as
established by GUE’s DecoPlanner.
If conducted in a cave, trainees must be at least GUE Cave 2 divers; instructors must be
Active GUE Cave 2 instructors.
18.104.22.168 Required Training Materials
GUE training materials and recommended reading as determined by the course study packet received via online download after GUE course registration.
22.214.171.124 Academic Topics
Introduction: GUE organization and course overview (objectives, limits, expectations)
Advanced mixed gas diving
Risks of decompression diving
Gas management during deep dives
Accelerated, omitted, and general decompression strategies
Deep diving logistics and planning
126.96.36.199 Land Drills and Topics
Dive team order and protocols
Gas switching procedures and protocols
Use of a bottom stage, with multiple decompression cylinders
188.8.131.52 Required Dive Skills and Drills
Demonstrate proficiency in safe diving techniques; this would include pre-dive preparations, in-water activity, and post-dive assessment.
Demonstrate awareness of team member location and concern for safety, responding quickly to visual indications and dive partner needs.
Demonstrate a safe and responsible demeanor throughout all training.
Demonstrate proficiency in underwater communication.
Demonstrate basic proficiency managing a GUE equipment configuration.
Demonstrate safe ascent and descent procedures.
Must be able to swim at least 500 yards/450 meters in less than 14 minutes without
stopping. This test should be conducted in a swimsuit and, where necessary,
appropriate thermal protection.
Must be able to swim a distance of at least 60 feet/18 meters on a breath hold while
Demonstrate proficiency in the ability to plan Tech 2 dives while accounting for
environmental conditions, available gas, and required decompression.
Demonstrate the clean and effective removal and exchange of multiple stages and
decompression cylinders while hovering horizontally.
Comfortably demonstrate at least three propulsion techniques that would be
appropriate in delicate and/or silty environments; one of these kicks must be the
Demonstrate good buoyancy and trim, i.e. approximate reference is a maximum of 20
degrees off horizontal while remaining within 3 feet/1 meter of a target depth.
Demonstrate proficiency in gas failure procedures, including valve manipulation, gas
sharing, and regulator switching as appropriate.
Demonstrate proficiency in managing gas sharing scenarios, to include a prolonged gas
Demonstrate proficiency with effective decompression techniques, including depth and
time management, while also managing multiple gas switches and other tasks like tank
Demonstrate diver rescue techniques, including effective management of an
184.108.40.206 Equipment Requirements
GUE base equipment configuration as outlined in Appendix A, plus:
GUE double tank configuration
Primary and back-up lights
Two decompression cylinders
One bottom gas cylinder
Small argon regulator and bottle where appropriate
One primary reel per team
Prior to the commencement of class, students should consult with a GUE representative to verify equipment requirements and appropriateness of any selected equipment.