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Tom / List, It would appear (based on IANTD standards in the UK) that steel bottles must be used for training and that Aluminium bottles simply do not cut it...... the following is part of a message I had from someone trying to do an IT course ...... "I've recently been told :( that I can't do the IANTD Technical Instructor course with the instructor trainer I wanted to, unless I switch back from ali to steel stage bottles. The instructor argued that [my] alis will float at the end of the dive if 2/3 of gas is used and that they regard this as dangerous in sea water decompression as it could add to the positive buoyancy of a diver. He said the bottles had to be standard 10 ltr steel (or larger if required) to be safe enough." Do IANTD really believe that ali bottles are dangerous in the ocean or is someone trying to pull the wool over our eyes? Perhaps this IT trainer does not understand how buoyancy works. What is the official IANTD line on this and do you think this is sufficient grounds for refusing to let someone train? Best, John. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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