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On the other hand,
Interesting. Had never heard of this. Was initially skeptical of the phrases internationally recognized and HSE-approved but I did find Microdive on HSEs approved list at:
http://www.hse.gov.uk/diving/qualifications/approved-list.pdf
along with BSAC, PADI, and more than a dozen others.
It also is condoned by the Royal Yacht Association, see:
Prop Torque | Mar13 | Up to Speed | e-Newsletters | News & Events | RYA
and:
http://www.rya.org.uk/SiteCollectio... Documents/Rule Book PB12013 no officials.pdf
Presumably the 3-metre Basic Diver course includes admonitions to not go below that depth without further training, just as traditional courses have similar admonitions about venturing beyond other depths.
The Royal Yachting Association has adopted the course as an RYA training option, given the benefit of Microdiving to boaters in being able to inspect and maintain their hulls.
I'm waiting to see the 'sidemount to 3 m micro dive' cert, might be fun to dive your local city sewer system!