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Ummm, excuse me, whilst I am no Tech Diver/Cave Diver (CDAA Cavern
Certification only)/Deep (whatever that may mean) Diver etc I do
occasionally employ twin tanks and similar toys and I do lurk on these
lists (getting amused, bemused, horrified, dismayed and probably a few
other things, as the case may be). I have to say that the u/w
photographic forum which I am extremely fond of, being my kind of bag,
has considerably politer language even when people violently disagree,
but each to his own.

Several years ago the Dive Club I belong to enjoyed the company of a
Canadian on secondment to our part of downunder and, as a parting
gesture, he wrote an article for our journal describing ice diving,
something that we Aussies would find particularly hard to do on our
continent (including Tasmania). One point he made is that they used to
employ a snowmobile (I think it was) to create circles at particular
distances from the entry/exit hole, depending on size of lake as well
as "spokes" at 12/6 o'clock and 9/3 o'clock, all of which could be
seen reasonably well under water. If all of the above is true (I have
no way at all of verifying it) it seems like a good idea.

Regards,

Christian
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