Twinsets on the other hand are two tanks attached to the back of the diver and are usually connected with each other thru a manifold. This means a diver can access to both tanks using a single regulator.
For dives deeper than 56m gas mixes called Trimix are used. In order to reduce narcosis and reduce the toxic effects of Nitrogen and Oxygen, Helium is added which has no negative effect on our body to very deep depth. There are additional risks with helium but those start at depths of around 180m. In history tests have been executed with different noble gasses, however they all turned out to be toxic for the human body, so helium was the only one adequate for diving. One other gas that has no effect on the human body is Hydrogen but due to its high risk of fire and explosion in contact with oxygen, the blending of it is very difficult if not almost impossible with the techniques we use currently.
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.
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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.
Additionally, sidemount diving has become wildly popular even for open water diving. Why? It is because sidemount diving can be very relaxing and simple to learn.
Gear - While the gear remains the same, divers taking an introductory tech class, such as Sidemount, Intro to Tech or CCR air diluent, will notice some configuration differences. Instead of two second stages on one cylindrical, they're divided between two with a separate initial stage for each. The gas planning becomes a more in-depth process, and the harnesses appear to have more chrome.
The Sidemount Diver Specialty course dive may count toward your Advanced Open Water Diver certification – ask your instructor about earning credit.
For dives past 130ft decompression divers blend some Helium into their cylinders and dip into the realm of the rarely seen. The reefs and wrecks they experience are sometimes visited less frequently in a year than astronauts to the moon.
Whatever configuration a diver chooses there is benefits for each and in different situations each configuration has its up or downside.
By allowing divers to exhale gas, the rebreather can extend their diving capabilities. The rebreather will then recycle the gas and inject the required amount of gas into the cylinder. This can dramatically increase the dive time when compared to using double the size and weight cylinders, especially for deeper dives. You can have rebreathers back- or sidemounted. The profile they create will depend on their configuration.
Computer-aided instruction is an integral component of almost every course we teach. The Why? The Why? We include all applicable eLearning programs, usually $140 in value, in our courses at no additional cost. This directly translates into an additional day of in-water training. What is the value? Priceless.
You must be at least a level of fitness and health to dive. You may need to have written permission from your physician if you have chronic health issues, take certain medications or are recovering from recent surgery.
International Training, the parent organisation for Technical Diving International / Scuba Diving International (TDI), offers both SDI (and TDI) versions of their Sidemount Diver courses. Both courses are very similar. Both courses share the same learning materials (which were written by us). What is the difference?
Technical diving (also known as tec diving or tech diving) is non-professional scuba diving that exceeds the agency-specified limits of recreational diving.