GUE Tech 2

Course Outcomes

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:

  1. Submit a completed registration form, a medical history, and a liability release to GUE Headquarters.
  2. Be physically and mentally fit.
  3. Hold insurance that will cover diving emergencies such as hyperbaric treatment, e.g. DAN Master-level insurance or equivalent.
  4. Be a nonsmoker.
  5. 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.
  6. Be a minimum of 18 years of age.
  7. Be a certified GUE Tech 1 level diver.
  8. 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.


Course Content


The Tech 2 course is normally conducted over five days; it requires seven dives and a minimum 40 hours of instruction, encompassing classroom, land drills and in-water work.

Tech 2 Specific Training Standards

  1. Student-to-instructor ratio is not to exceed 6:1 during land drill or surface exercises; ratios cannot exceed 3:1 during any in-water training.
  2. Maximum depth 250 feet/75 meters.
  3. Dives should not be planned to incur more than 60 minutes of decompression time as established by GUE’s DecoPlanner.
  4. If conducted in a cave, trainees must be at least GUE Cave 2 divers; instructors must be active GUE Cave 2 instructors.


Training Materials

GUE training materials and recommended reading as determined by the course study packet received via online download after GUE course registration.


Academic Topics

  1. Introduction: GUE organization and course overview (objectives, limits, expectations)
  2. Advanced mixed gas diving
  3. Risks of decompression diving
  4. Gas management during deep dives
  5. Accelerated, omitted, and general decompression strategies
  6. Deep diving logistics and planning


Land Drills

  1. Dive team order and protocols
  2. Gas switching procedures and protocols
  3. Use of a bottom stage, with multiple decompression cylinders


Required Dive Skills and Drills

  1. Demonstrate proficiency in safe diving techniques; this would include pre-dive preparations, inwater activity, and post-dive assessment.
  2. Demonstrate awareness of team member location and concern for safety, responding quickly to visual indications and dive partner needs.
  3. Demonstrate a safe and responsible demeanor throughout all training.
  4. Demonstrate proficiency in underwater communication.
  5. Demonstrate basic proficiency managing a GUE equipment configuration.
  6. Demonstrate safe ascent and descent procedures.
  7. 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.
  8. Must be able to swim a distance of at least 60 feet/18 meters on a breath hold while submerged.
  9. Demonstrate proficiency in the ability to plan Tech 2 dives while accounting for environmental conditions, available gas, and required decompression.
  10. Demonstrate the clean and effective removal and exchange of multiple stages and decompression cylinders while hovering horizontally. 
  11. Comfortably demonstrate at least three propulsion techniques that would be appropriate in delicate and/or silty environments; one of these kicks must be the backward kick.
  12. 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.
  13. Demonstrate proficiency in gas failure procedures, including valve manipulation, gas sharing, and regulator switching as appropriate.
  14. Demonstrate proficiency in managing gas sharing scenarios, to include a prolonged gas sharing event.
  15. Demonstrate proficiency with effective decompression techniques, including depth and time management, while also managing multiple gas switches and other tasks like tank rotation skills.
  16. Demonstrate diver rescue techniques, including effective management of an unconscious diver.


Equipment Requirements


GUE base configuration as outlined in Appendix A, plus:

  1. GUE double tank configuration
  2. Primary and backup lights
  3. Two decompression cylinders
  4. One bottom gas cylinder
  5. Small argon regulator and bottle where appropriate
  6. One primary reel per team


Explore GUE Standards


Prior to the commencement of class, students should consult with a GUE representative to verify equipment requirements and appropriateness of any selected equipment.