Submarines have a low reserve of buoyancy anyway, compared to surface ships. The biggest danger is at diving when, because of neutral buoyancy, they can be easily rolled over, and ice on the superstructure could increase this risk.The higher up the weight the greater the rolling moment and if the downward force exerted by the roll moves outside the righting moment pushing up, ie, outside the hull, the hull will capsize.Similar to the leaning tower of Pisa which will fall if and when the downward force moves outside the base.I believe they used to dive frequently in order to remove ice build up.
R.R.
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