It was difficult to get into the pool for my first session. I felt like an open water diver, securing myself in twin tanks and conducting valve drills. As we went through the Tec 40, 45, and 50 courses, I found new skills and was enjoying the course. The best part about Tec diving is the ability to improve your buoyancy, awareness and dive skills. It's quite an experience to know that you can manage life-threatening emergencies at depth without having to go to the surface due to decompression requirements. It's also satisfying to execute your dive plan with military precision.
Different depths require the use of different gas mixes. The maximum partial pressure of oxygen a diver wants to dive at is 1.4 which is reached on air at 56m. Due to the water pressure the pressure of each individual gas increases and therefore we need to use appropriate mixes if we choose to go deeper. In general, the more oxygen a gas mix has the less deep we can go. A tech diver will use low oxygen mixes at depth and high oxygen mixes coming up shallower to off-gas Nitrogen faster and decrease the mandatory decompression time overall.
Technical diving is growing in popularity and it didn't take long until it grabbed our attention here at Girls that Scuba HQ! But we had a lot of questions first and a few nerves so we headed to the woman in the know - one of the only female tech instructors in Asia - Theresia Gollner - who is working at Blue Marlin in Gili T, Lombok. She gave us an intro course to twin sets and let us into the wonderful world of technical diving. Here's what she taught us:
The popularity of sidemount diving continues to grow, even when it is open-water. Why? Sidemount diving is very simple and comfortable.
Sidemount regulators can also be used. One regulator will be on a long length hose, while one regulator will be on a shorter one with a necklace. Sidemount regs have a marked design, which makes it easy to identify the tank you are in. This also included a swivel connector for my short-hose regulator. Two SPGs will be provided - one for each stage.
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Sidemount rigs were originally designed for cave diving. They allow the diver to easily pass through cracks and restrictions (tiny holes), much faster than traditional back mount rigs.
Skills (specific) – Throughout the tech programs the specific dive skills for that category of diving are practiced until faultless. For overhead diving navigation and line skills are honed in until they’re automatic. Decompression divers can plan and execute the stops and gas management without blinking an eye. Rebreather divers meticulously build, test and break down their units to ensure perfect functionality of the equipment. Skills for each course are laid solid in the first level of certification, and advanced from there. Each step deeper or further hones these skills and adds additional challenges to develop a well rounded, well prepared and well informed diver.
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Because of the difficulties with single orifice doubles and backmounted independents, doubles were introduced to backmounted diving. Independents are two cylinders that are strapped to one's chest with separate regulators. A 1st stage failure would result in only one cylinder being used by the diver. A single orifice double was two cylinders connected together by a valve and one regulator. All gas would be lost if the first stage of a single orifice twice set failed. Today, both problems are eliminated by the isolated manifold doubles. Each cylinder can be operated independently. However, the diver can still inhale gas from both cylinders using one regulator. The doubles are usually held together by metal bands. The valves are connected with an isolation manifold so they can be separated if necessary. Doubles diving with backmounted doubles is similar to a regular single-cylinder backmount. It offers a vertical profile that is the same.
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‘Shadow Divers’ by Robert Kurson is about the identification of a German submarine that was tried to be identified by John Chatterton and his crew during almost a decade.
Sidemount provides many benefits for divers but is best suited to cave diving. Sidemount was in fact invented by cave divers. These are just some of the benefits.
Make sure you understand what you're buying: Prices include instruction as well as eLearning fees. Remember that eLearning fees can run anywhere from $140 - $280. For example, a $640 course offered by us may be equivalent to a $500 course provided you pay separately for elearning.
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.