The next day it was on to technical sidemount, which means adding our deco 50-percent oxygen and 100-percent oxygen tanks on either side. This increases your profile underwater so you must keep the tanks as trim as possible against your body. You have a couple of clips on each side of your waist. As you breathe down your tanks and they become positively buoyant, you adjust your tank position to the second clip position. The aim here is to be as streamlined as possible. Every few minutes you also switch your breathing from one tank to the other. That way the pressure in each tank runs down at roughly the same rate, and if there is a failure with either tank or regulator, you’ll still have gas to breathe. As with all new things, building up experience is key to comfort and enjoyment. I spent the next few days doing deco dives with the sidemount rig, buddied up with Evolution co-owner David Joyce — a hugely experienced Tec diver and Trimix instructor. On one dive we visited the Japanese Mogami wreck down at 164 feet, where I was beguiled by the bits of old gas masks, uniforms and even a few bones we saw.
Take a look at these three options if diving classes and lessons are not what you desire or you need to decide where to go next.
Sidemount BCDs are a harness that has a bladder and an intricate system of sliding D rings, bungee cables, and clips. They are important for the tank position and trimming later in the water. Your instructor will likely spend quite some time making sure they fit perfectly.
Although we can teach the SDI course if specifically requested, by default we offer the TDI one. It is possible to take this as a standalone program; however, our students generally combine this with our Apprentice Cave Diver course.
A Twinset diver will always be able to access to both tanks from one single regulator as long as the manifold, or the connection between both tanks is open. To carry a twinset for a smaller person might be a challenge on land. It is quite heavy and sidemounted tanks can be carried individually which sometimes makes it easier to access remote areas or steep slopes to access the water.
If you want some diving classes alternative and lessons or want to know what's best next for your education, take a look at the three options below.
Certificate cards: These are issued only to those who have earned them. Certification is not guaranteed by simply taking part in a course. Multiple training agencies might offer certification cards for cave courses. C-cards usually cost about $30, depending on which agency you choose. Talk to your instructor for details.
This course will teach you how to set up and operate the equipment that you will use in your training as a cave diver or tech diver. This includes:
One of the big risks for a technical diver is decompression sickness. It occurs when nitrogen gas cannot exit the body thru respiration on ascent as the ambient pressure decreases. Therefore stops have to be executed on ascent in order to avoid a pressure difference too big so nitrogen bubbles can be formed. Buoyancy control is very important to control the stops on ascent and increase efficiency for off-gassing of nitrogen. Another important skill is proper breathing which makes metabolism efficient. Trim, which we call a proper tech diving position such as horizontal with a slight arch in the back, looking forward and knees at a 90 degree angle with fins pointing back. Trim prevents stirring up sediments on the bottom as well as most efficient movement in the water. And of course proper finning techniques to avoid overexertion are mandatory to make a diver achieve maximum performance. Now you might say, we want to have fun when we go diving and not be a machine.
Sidemount Diver Specialty courses may count towards Advanced Open Water Diver certification. Ask your instructor.
1. Your personal informations (name, email, etc). 2. Choose your preferred date 3. Simply submit your question/inquiry to ask.
My first pool sessions were difficult. I felt like an open-water diver once more, strapped into twin tanks and trying valve drills. The Tec 40 and 45 courses were difficult at first, but I soon found that new skills became natural and I enjoyed the course. The joy of Tec diving lies in taking your diving skills, buoyancy, and awareness to the next level. The feeling of knowing that you are capable of handling life-threatening situations at depth and without needing to descend to the surface (dues to decompression requirements) can be quite satisfying. It's satisfying to execute your dive plans with military precision.
At first, technical diving was not something that interested me. I can clearly recall chuckling to my self at the Tec divers I observed, and wondering why anyone would want to have more equipment under water. I love the feeling of freedom and closeness to nature that can envelope you in "the quiet world". Tom was a respected teacher who I felt it was important to share my experience in Tec courses with.
Sidemount cylinder mounting was first used for cave diving. It has since become more popular in technical diving. They take the dual cylinders apart, one for each, and place them on either side. The diver can't breathe from either cylinder if the regulator fails, but this allows for easier access to valves. Sidemount diving gives the diver an increased horizontal profile and a smaller vertical profile.
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.
5-6 days
Rebreather training classes are typically 5-6 days long, but can be longer depending on a variety of factors such as the training agency, your local conditions, your instructor, and your ability to meet the class standards.
2-3 hours
Even with small cylinders, you can usually dive for 2-3 hours (rebreathers typically have two 2/3l cylinders or one 3/5l cylinder).