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At the risk of being flamed can someone explain the logic of forcing a diver interested in going onto trimix into doing deep air dives??????? To get onto a trimix course one must first undertake a nitrox course, in some instances two or three nitrox courses (basic, advanced and extended range) which basically in the deeper dives has no benefit other than accelerated decompression via the use of nitrox or pure 02 during deco. A perfect example is a course covered in an article in the latest "Dive" magazine, this editorial explains how students on the divers lodge basic (TDI) trimix course simulate a trimix dive to 45m dive with air as the back gas ???????????? What logic is that If trimix or Heliox is the way to go why subject students or divers interested in improving their diving safety and enjoyment to what is effectively deep air diving. If He is safer than N2 then why should a diver not be able to use say a 21/12 or 21/18 mix ( or other ) to depths up to say 50 - 60 metres without going through a nitrox course? If they want to use nitrox or pure 02 for deco then they should undertake a course to cover the use of higher pp02 as a deco gas I realise and understand that if a diver wishes to do deep trimix dives which involve significant planning and skills then a greater level of experiance and maybe an intermediate qualification is required before taking an advanced trimix course but access to He should be made easier at the 30 - 60m ranges Mike ---------------------------------------------------------- This message was sent using http://uk2.net UK's FREE Domains, FREE Dialup, FREE Webdesign, FREE email -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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