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Many years ago now we had a Canadian, on secondment to Australia, become
a member of our small, private, intensely independent Dive Club.

Just before he returned to Canada he wrote an article about ice diving there.

One of their techniques was to use a small snow plow to create
concentric rings of snow-free ice around the hole, roughly every 10
metres (33ft) with the ploughed up snow discarded to the side _away
from_ the hole. Divers looking up could see the extra light and,
especially the darker side with double the snow.

Sounds like a good idea to me. Mind, I have absolutely no idea how well
this would work in practice.

Christian
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