While diving under ice is
great as there's no swell, no waves and fantastic viz, this
disadvantage is that the entry/exit hole is small and it can
be pretty dimly lit down there, especially if there is a layer
of snow on top of the ice.
Natural breaks in the ice like
this one therefore are particularly good as the ice is still
there, but it helps deal with disadvantages somewhat.
You can gauge the size of the
hole as the photographer is on the opposite side of it to the
diver and using a standard lens on the camera. Note, I'm not
using a life jacket here, if you get it wrong or have an emergency,
you could end up stuck against the ice and unable to take it
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