Bill, I've always understood there to be an air gap between the ice and the water, but maybe I've been watching too much TV
In the past, with all the air being pushed against the ice, I've seen it escape at the shoreline but also wondered how much pressure it's creating, if it is, such as yours running for 7 hours before breaking through! I do know there has to be a tremendous amount after witnessing Old Faithful on my own pond.
Does all that pressure have any adverse effect on the fish (stress to a harmful degree)?
