The Doubles Mini is designed to provide the diver the basic knowledge and skills to enjoy diving in the Hogarthian double tank configuration safely.

Double tanks ("Doubles") provide an advantage over the single tank by providing complete redundancy and larger gas volumes.  However, doubles can also be a bit tricky to balance and trim, due to the additional cylinder and hardware.  

Additionally, since doubles have 2 valves, 2 first stages and an isolation bar/manifold, the diver must have a thorough understanding of how each valve and first stage and the isolator work individually, as well as how they function together in a system, in order to dive the system safely.

This is not a critical skills class. Failures will not be introduced by the instructor in this class.



This one day mini provides an overview of how to balance/trim your doubles, how the valves and manifold function and how to configure your doubles safely and efficiently.

It's designed for any diver wanting to learn how to dive doubles, wanting to gain an understanding into how those valves, first stages and manifold work, or those who are struggling to get comfortable in doubles.

Doubles are not exclusive to technical or overhead diving.  They offer many advantages to the recreational diver, such as increased volume, redundancy and provide the convenience of not having to bring and switch out multiple tanks between dives on multi-dive days.

Regardless of experience level, this workshop will improve your comfort in double tanks.  Divers new to doubles will appreciate the shortened learning curve on getting balanced and experienced divers will appreciate gaining the knowledge of why they are configured the way they are, as well as how to easily reach their valves.

Aspiring technical divers will appreciate the head start on their future technical training.


This 1 day workshop focuses on providing the diver the knowledge, tools and skills to get comfortable and balanced in doubles, as well as a thorough understanding of how, and why, they are configured the way they are, the possible failures associated with doubles and the identification and management of those failures.

This mini doesn't just teach how to trim out doubles.  It provides the diver with the knowledge of how they should be assembled, how they are configured, why they are configured that way, how to identify and manage problems/failures and how to reach their valves.

Students will then have 2 dives to work on gaining comfort, balance and trim in doubles, and practicing valve drills.

We will "dry run" all skills.  Dry runs allow the student to practice the skills on land under the watchful eye of the instructor(s), allowing them to practice and discuss the skill prior to performing them underwater. 


This class is designed to provide a hands on application of how to configure your doubles, proper regulator configuration and hose routing, backplate & wing considerations and proper harness fit, which is critical when diving doubles.

Time is spent on a thorough discussion of how the valves, 1st stages and manifold work together as a completely redundant system, and how they can work independently.  We then spend time discussing the potential failures (9 failures) and how to identify and manage the failures.  Though this is not a critical skills (failures) class, and no failures will be introduced by the instructor, we feel it's important the diver have an understanding of how the doubles work, and the considerations when diving with doubles.

Our diving days end with video review of the day's dives.  All FKD classes are video'd for educational and review purposes only.  We believe it 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 the class.  

Our focus is the complete dedication to your diving skills, knowledge & in water practice.



  • Minimum 16 years of age
  • Certified diver from a recognized training agency


  • Maximum depth is 60'.  Average depth 20 - 100'
  • All dives are to maintain a working PO2 of no greater than 1.4
  • Standard gas: Air or EAN32
  • No overhead environments
  • Instructor to student ratio maximum 6:1 in open water, adjusting downward for environmental conditions.


  • 1 day, 2 dives, 4 hours of academics

All UTD / FKD classes are video'd for educational and review purposes only. We believe it 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 the class. 


  • Complete the academic materials (online or book)
  • All UTD & FKD classes are non-smoking
  • The use of prescription drugs must be authorized prior to the onset of diver training by a physician


  • Double tank configuration 

Equipment Requirements Page

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