Cave passages formed over millions years of water erosion and extending thousands of feet from their entrance are reserved only for overhead divers. They are stunning in their beauty and peacefulness, but only because they were formed so long ago.
Next, it was time to do technical sidemount. This involves adding our deco 50-percent and 100-percent oxygen tanks on each side. You will have a higher profile underwater, so it is important to keep the tanks as close to your body as possible. There are two clips at each side of the waist. You adjust the tank position by inhaling down your tanks. This is where simplicity is key. You also need to switch between tanks every few minutes. This ensures that the pressure in each tank is at the same level, so even if one tank or regulator fails, there will still be gas for you to breathe. Building up experience is the key to comfort, enjoyment and success with new technologies. The next few days were spent doing sidemount dives, budding up with Evolution coowner David Joyce, a highly experienced Tec diver and Trimix instructor. One dive took us to the Japanese Mogami Wreck at 164 feet. I was captivated by the old gas masks, uniforms, and bones that we found.
Sidemount cylinder mounting originated for cave diving and have become more popular in all forms of technical diving since. They separate the dual cylinders, with a 1st stage on each cylinder, and mount them on either side of the diver’s body. This doesn’t allow the diver to breathe from either cylinder in the event of a regulator failure, but does give the diver easier access to valves. Sidemount diving gives the diver a larger horizontal profile, but a smaller vertical profile.
Academics – The academic parts of technical courses are similar to any other class in scuba diving. Students will learn from their instructors and do some self-study. Technical courses require a lot more planning than most people are familiar with, but they are crucial to a successful dive. Gas management will be a more involved part of overhead and decompression dives than many divers are used. The computer program calculates the required gas volumes and reserves for each dive.
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Academics - A technical course's academic portion is very similar to other scuba classes. Students will be required to do self-study and share their new knowledge with their instructor. Although the dive planning requirements for technical courses are more complex than what most people are used to, they are essential in executing a successful dive. The gas management portion of the planning discussion for overhead and decompression diving will take more time than most divers are used. A computer program is used to calculate the gas volumes and reserve required for each dive.
Sidemount and technical sidemount were my first courses. Sidemount diving is, as its name implies, where you place your tank in front of you. By the end of the session, my hands were covered with cuts. You can remove the tanks from their clips and place them in front of yourself, Superman-style, to streamline your life. The afternoon dive went much smoother after some adjustments to the harness. I was now comfortable unclipping the harness and 'Superman-ing" with the tanks. Sidemount is a great way to have more freedom than having two people on your back. Matt created obstacle courses, and soon we were flying around them with tanks at our fronts, barrel-rolling, and swimming upside down.
The entry-level tech diver will be trained to optimize their equipment to reduce drag and avoid dangling gear. This will ensure a maximum profile for efficient propulsion, awareness and propulsion.
Mindfulness - Technical diving can still be fun. Technical diving is all about seeing cool things. However, technical divers can see more than sport divers and are able to see deeper, further, and in places that are not visible to sport divers. Technical divers can still be fun, but they are also very focused. While jokes are still allowed, there is no denying that laughter can be had. However, it is important to be serious about dive planning and execution. There are risks to diving. Those risks increase if you don't plan well, practice your skills and execute properly.
Another scuba diving agency might be of interest to you: PADItec sidemount diving course.
International Training, which is the parent organization for Technical Diving International / Scuba Diving International, offers both the SDI version and TDI versions their Sidemount Diver course. Both courses can be used in the same way. Both courses use the exact same learning materials (which, obviously, we wrote). What's the difference then?
Certification cards: We issue these only when earned. Simply taking part in a course does not guarantee certification. For cave courses, certification cards from multiple training agencies may be available. C-cards generally cost around $30 each, depending on agency. Your instructor can tell you more.
At first I was not interested in technical diving. I vividly remember chuckling at the Tec divers who I saw and wondering what made them want to take more equipment. I love the sense that you can be close to nature while feeling free and connected. Tom was a well-respected teacher. I felt it only right to give him a try as I was working in a dive shop offering Tec courses.
Have a PADI Deep Specialty Instructor certification or have completed a PADI Deep Specialty Instructor course. Have at least 100 logged dives, including at least 20 enriched air dives, 25 dives deeper than 18 meters/60 feet, and 15 dives deeper than 30 meters/100 feet. You can become a Tec 45 diver.
According to experts, approximately 40% of technical divers enroll in additional education and training programs. This yields a reasonable estimate of approximately 160,000 active technical divers worldwide.
from 170 to 350 feet
While conventional scuba diving has a recommended maximum depth of 130 feet, technical divers may work at depths ranging from 170 feet to 350 feet, and sometimes even deeper.