Basic Trimix Diver

Upcoming Course Dates

September 3-5, Tuesday to Thursday after Labor Day

October 13-15, 2019, Sunday thru Tuesday - Class Full

My Trimix Diver Course

JC_Captain Dan_4_smallMy Basic Trimix Diver Training Course meets all of the standards for the TDI Normoxic Trimix certification, however I integrate what I feel are the core elements of the TDI Extended Range course into this training as well. IMHO, there are important lessons to be learned by diving air to deeper depths (around 180'), prior to assuming the additional responsibilities of deeper dives on more complex gas mixes. Students who successfully complete this training should be able to competently plan and conduct decompression dives on Air or Normoxic Trimix, up to a depth of 200 fsw.

This class is offered independently by me in Pompano Beach, Florida. The course consists of three days of training, ideally with lecture and diving each day. There are a total of 4 required certification dives, conducted two air dives on Day One, a single deep air dive on Day Two, and a single Normoxic Trimix dive in the 200' neighborhood  for the third day. The planned dive in the morning, lecture in the afternoon schedule may be rearranged to accommodate the best weather conditions.

This is a fun class. It is fun for me to teach, and a great experience for students. Dives requiring mandatory decompression are supposed to be fun, but in general they are serious dives, no matter what gas the diver is breathing. Technical dives are typically more challenging than mainstream recreational dives, so divers need to be reasonably fit. This is an intensive three day program where we cover a lot of diving theory, but we also put in a lot of bottom time working on skills, and applying what we learn in deep water.

Long, mandatory decompression dives, with multiple gas switches can be intimidating.  We counter this intimidation with knowledge, preparation, and structure. This builds a foundation for justified confidence. You need to know what you are doing. However, in three days we simply cannot make you an expert at deep air, or Trimix diving. What I do, is try to prepare you ahead of class with lots of relative intellectual material, so you arrive ready to make the most of our time together, which will enable you to continue to learn, and acquire additional experience, beyond the time restrictions of the class.

Students that complete the requirements of the program will receive the TDI Trimix Diver certification, however participation in the program is no guarantee of successful completion and getting a certification. Divers must earn their certification, by meeting all of the TDI requirements, including a written final exam.

The two class textbooks will be the TDI Extended Range/Entry Level Trimix Manual, and Deep Into Deco, by Asser Salama. Student divers will be required to read the texts completely prior to the beginning of the class. I will mail or deliver the books to you as soon as you register for the class. Students will also be assigned some additional study materials to review prior to class.

In addition to meeting all of the Prerequisites, students will be required to read and sign the TDI Liability Release, and complete the TDI Medical Form. Students may have medical issues which will require the student to have their doctor to sign off, prior to the start of class. The most important thing for me is the safety of my students, and if there is any doubt about a student's ability to participate, this needs to be addressed by the student, their family, and his/her physician, prior to the start of class.

The weather is typically great in Florida, and that's why they call this the Sunshine State, however there are bouts of bad weather, and even the dreaded hurricane. It is entirely possible that we could lose one or all of our dive days due to weather. We will always do the best we can with the weather we have, but I can't expect you to learn how to make good decisions with regards to diving, if I am making bad weather decisions with regards to our diving together. If I make a mistake, it has to be on the side of safety.

If the advance weather forecast is undeniably terrible, as in the case of a hurricane, I will make a decision to cancel the class in advance, and reschedule. If we lose dive days due to weather, I will make them up with you, on mutually agreed upon dates. If you are flying to Florida, you may want to consider travel insurance? DAN now offers travel insurance, as do other insurance providers. At the same time, the weather is the weather and we will try to do the best we can to get you to safely complete your dives. If you miss a dive for any reason, you have 12 months to complete the dives for the certification.

If you have any questions, feel free to shoot me am email

  1. Students must be at least 20 years of age.
  2. Students must be certified as a TDI Advanced Nitrox and Decompression Procedures Diver, or equivalent.
  3. Students must show a minimum of 100 logged dives.
  4. Students must have dive accident insurance.
  5. Students must possess a level of physical and mental fitness suitable for the pressures of diving in the wreck environment to a minimum depth of 200 fsw.

You are already a Decompression Diver, which means you possess a higher level of experience, education, and training, than the vast majority of scuba divers. You are among the elite. The bulk of this course is perspective, and academic material. With regards to skills, it is more about honing the skills you already have.

As a result, I assume that you are already very familiar with your diving gear. The required equipment list only makes sure we are both on the same page. I apologize if you already know most of this, but please bear with me.


  1. IMHO, back mounted double steel cylinders with a manifold are the best primary cylinder setup for Open Circuit deco diving. Side mounts, or Twin K Valves will also work. You will need cylinder(s) with volume(s) appropriate for Trimix dives planned to 200’, considering your individual SAC rate. All cylinders are to be labeled according to TDI Standards, which means Nitrox/Trimix cylinders need to be labeled for Nitrox/Trimix. An O2 clean Deco Cylinder is required for the class, rigged to carry, along with a second Nitrox Deco Cylinder. Bring whatever sizes you prefer. Typically, I will utilize a pair of AL72  for classes. Twin Faber LP85's, and HP120's cylinders with two Aluminum deco cylinders can be rented for this course here in Florida, through me. Complete cylinder rentals for the 3 Days - $75
  2. Regulators:
    1. You will need a Primary and a Primary Backup regulator on your Bottom Gas supply.
    2. You will need two deco gas regulators, one O2 clean.
    3. You need an SPG, or integrated transponder connected to the first stage regulator, for each gas supply, not necessarily each regulator.
    4. You will need a “Necklace” or some other way to hold your backup second stage regulator in place around your neck. I prefer using simple 1/8" bungee and not the rubbery, store bought ones where the regulator keeps falling out. A bungee necklace just works better for me.
  3. For this course, it is mandatory that you use a Dual Bladder Wing, or dive a dry suit. Simply put, in 200 feet of water, we do not have the time to screw around in the event of BCD failures, which occasionally happen. I like the DiveRite Rec in 45# with the dual bladder.
  4. For this class, I am making a Shearwater Dive Computer mandatory. You also will need a backup computer or depth gauge. In the classroom, we will download your dives on the Shearwater, and dissect them. This makes the Shearwater a valuable learning tool for you, and it will make a definite difference in the way you dive. If you do not have a Shearwater, and do not wish to buy one, I will rent you one for the three days of class - $25.
  5. You will also need a means to plan your dives using your dive computer, Smart Phone, laptop, or tablet. The algorithm of your planner should match the algorithm of your dive computer. Examples of popular dive planners are IDeco, Ultimate Planner, Baltic Planner, and Multi-Deco. You can link to the MV Planner free download
  6. You will need lights:
    1. One Primary Light.
    2. One Back Up Light.
  7. You will need to bring with you at least one Ascent Reel with a minimum of 150' of line on it, and at least one SMB (4-6').  I prefer open bottom SMB's that allow you to fill with your BCD. Bring what you have been using.
  8. Two  Line Cutting Devices are required, and they both need to be sharp.
  9. A usable underwater slate, wrist slate, or notebook, and a writing implement are required. I like the Pilot Croquis 6B pencil. I don't like tiny little Miniature Golf pencils. We will use the slates for recording important elements of our dive plan.
  10. Bring two spare double dog clips, for attaching accessories, but no gate clips.
  11. You need a wetsuit or drysuit, with hood, suitable for the water temps for the dates of the course. Feel free to call me for a better handle on water temps and further advice.
  12. You need gloves to protect your hands. You can use neoprene dive gloves if you like, but rubber coated work gloves are adequate for the warm water environment. My favorite, Dyneema gloves by Hammerhead, with the smooth polyurethane coating, not the crinkly ones.
  13. You need a comfortable mask, and a backup mask with a way to carry it, which is typically a pocket. I just buy a pocket, and glue it on my suit. I like the Apeks WTX, with a zipper. I am not a fan of Velcro. If I glue one on the front thigh, if helps to hold my (BFK) on the side.
  14. You need comfortable fins, for longer dives. I like the Mares Power Plana.
  15. If you need to wear lead weights, make sure you bring a belt or harness to hold them. The lead weight you can get here.
The cost of the class is $1,300. This includes all of the training, the 4 boat dives (over 3 days), the class texts, and the Trimix Certification from TDI. There are no additional class costs, however students are responsible for all of their own equipment, maintaining it in working order, gratuities for the dive boat crew ($10 per diver per day is customary for reasonably good service, $20 for exceptional service), and cylinder rentals (if required) as well as all the gas fills for the dives. Of course, students will be responsible for all their own transportation, meal, and lodging costs as well.

Prospective students who meet all the requirements, may reserve a place in class with a $650 non-refundable down payment. I will invoice you through PayPal and you can pay by credit card, check, or of course PayPal. If you have any doubts about your ability to participate in this class, please do not make a commitment until you are sure you are going to be able to attend. The balance of $650 is due on the first day of class. Checks, cash, credit cards, and PayPal are all accepted. If you have any questions at all, please feel free to contact me.

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