Before getting into the water
a check needs to be done in case there's a seal around that
might just be on its way up for air. One guy I knew had
a seal pop its head up at his feet when he was just about to
slip into the water! That never happened to me unfortunately,
but I did see seals appear when I was being a line man and the
divers were down and in particular when we'd just broken the
ice on a hole to set a fishing net - they were more common then
as we set nets a lot deeper than the shallower areas where we'd
dive.
Seals were reputed to be more
approachable with the twin hole demand valves we had as the
bubbles come out from the unit which is attached to the tank
behind you head and not from your mouth. They are a bit harder
work than single hose units (have to suck more) but it was nice
not to have bubbles going past your face all the time.
Paul Ward -
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