Class Information

This class is structured around 4 days, and involves a minimum of 6 hours of instruction and 6 dives (4 practice & critical skills dives, 2 experience dives). This class is designed to provide a working knowledge of the use of hypoxic trimix and two decompression gases.  This course is an  extended decompression class, divers in this depth range must be aware they will be entering into mandatory extended decompression commitments and should be prepared to do accelerated decompression on the fly after extended bottom times at a max depth of 200' on the experience dives.  Decompression will not exceed one hour.

Upon successful completion of Tech 2, the diver is fully qualified to conduct technical dives to 200' using standard helium gases of 18/45 and 15/55 with two decompression gases of Nitrox 50% and 100% oxygen, with the option of a bottom stage (if endorsed).  

​The limits for a UTD / FKD Tech 2 diver are:

  • Depth of 200'
  • Two decompression bottles
  • One bottom stage (if endorsed)  
  • Maximum decompression is one hour

All UTD / FKD classes are video'd for educational review, as we believe this is invaluable for students to visually focus on their individual in-water skills, situational awareness, communication, and team diving. Learning to self evaluate is an important aspect of any class, and video is one of the most important tools we have for instruction. 

Our focus is the complete dedication to your diving skills, knowledge & in-water practice. To help prepare for the rigors ahead, please contact us, you can find out more information about the class, the equipment and skills you will be evaluated on.​​


Minimum 21 years of age

Tech 1 or equivalent

Minimum 200 dives beyond Open Water certification

Minimum 25 Tech 1 level dives

Overview/Course limits

Maximum depth is 200’.  Average depth on non-experience dives is 20 - 100'

All dives are to maintain a working PO2 of no greater than 1.4

Standard gas is Nitrox 32% & standard hypoxic helium mixes of 18/45 and 15/55

Double tank configuration including a 40cft deco bottle of 100% oxygen and 40cuft bottle of Nitrox 50% and 80cuft stage bottle of bottom gas (if endorsed), limited to one hour of decompression per dive

No overhead environments

Instructor to student ratio maximum 6:1 in open water, during land drill, surface exercises and Experience Dives but 3:1 during any direct in-water critical skills training.


Complete the UTD academic materials (online or book)

All UTD classes are non-smoking

The use of prescription drugs must be authorized prior to the onset of diver training by a physician

Must be able to swim a distance of at least 50 feet/15 meters on a breath hold

Must be able to swim at least 300 yards/275 meters in less than 14 minutes without stopping

All participants must tow a diver in full equipment, in the environment they will be diving in at least 400 yards in 16 minutes

All participants must demonstrate a rescue of a diver simulating oxygen toxicity

Required Equipment

See our Equipment Requirements Page

We do have equipment available for use.  If you have any questions on equipment requirements please contact us prior to registering.

Tech 2 is taught in double cylinders with backgas of Nitrox 32% (for skills dies) and standard gas helium mixes of 18/45 and 15/55, with two decompression bottles of Nitrox 50% and 100% O2 for accelerated "on the fly" decompression.  Extensive academic discussions and experience dives will focus on selecting the proper backgas, with heavy emphasis on decompression gas management and multiple decompression bottle management.

The diver will be entering mandatory decompression obligations in this class.  This allows the diver to conduct his own technical dives in the 200’ range with two decompression bottles (a stage bottle endorsement is available with this class). 

Tech 2 expands on the Tech 1 skills, and is designed to cultivate, integrate and test these skills, which are essential for safe technical diving, . 


Technical Diver 2, or “Tech 2” (previously called Trimix 1), is the next step in our technical diving sequence, building on the skills the diver learned in Tech 1.   It introduces the diver to deeper depths and dive complexity, using hypoxic trimix and two decompression gases.

It's designed to continue the diver's pursuit of technical diving, giving them the training and ability to dive to 200' using standardized bottom gases of 18/45 and 15/55 with two decompression gases (Nitrox 50% and 100% oxygen).​  New material includes the nuances of using hypoxic trimix, gas management and failures management of multiple decompression gases, and the in-water management of multiple decompression bottles​.

This is a critical skills class. Failures will be introduced by the instructor to facilitate problem identification and resolution and building capacity and bandwidth for more progressively challenging diving.

In this class, students will be trained in the use of double cylinders and the potential failures associated with them, and the use of two decompression bottles (Nitrox 50% and 100% oxygen) for accelerated decompression, ratio deco, the use of helium to minimize narcosis and the applications of two decompression bottle stage diving with respect to decompression procedures.