Underwater,the deeper you go,the more force-or pressure-you have pushing against you.In a sideways sort of way,it is the same cutting through a stump.As the blade cuts wood,there is more force exerted against the saw blade.In other words,the emptiness left behind by the cutting action is replaced by the now displaced weight of the stump.
A good way to counter act this is by using little bits and pieces of the bark,and placing them as supports where the blade has left no support.
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