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One of my former OW/AOW students a few years ago earned T1 certification after 230 dives, 2 years of diving. I don't see the problem if they have the skills. And if it wasn't for the new job, he'd be diving a rebreather now.In general i see too much blabla and not enough diving. Fast track to "success"..gue fundies guys doing t1 after just 150 lifetime dives...and already during their t1 class where they barely make it talking about ccr courses.
The "core" technical skills aren't about helium, it's about extending your bottom times safely well beyond the scourge of the NDL (non deco limits). For example doing 75 minutes at 30m/100ft and 20ish mins of decompression. Or doing an hour at 40m/130ft, with about 45ish mins of deco. All of those are done without helium (unless you really want to spend money on gas!).I just did my TDI intro to tech here in Moalboal, Philippines. IMHO best course to start with to assess readiness for certain skills absolutely needed for further tech courses. Yes helium is a bit expensive here but that will be necessary at the higher level courses. For the rest the course fees are cheaper and the best part is the cost of living is cheap. You have to factor in cost of your stay here since the courses could run into weeks if taken together as a package.
To become a well-trained technical diver, you should take the next grades, PADI TEC 45, PADI TEC 50. After completing the “50” course, you will be able to take a technical diving course, in which you use a gas called “trimix” to breathe. These courses are PADI TEC TRIMIX 65 and PADI TEC TRIMIX DIVER.