Depends on your circumstances. That's risky. Messing with the environment could allow one to break free of the ice unexpectedly. I would say winter is a time for provisioning and planning. Some of that may involve clearing areas where necessary.
Either way, there are many questions to be asked - how big a group, how far down the road are you planning for, do you find a defensible "fortress" or stay on the move... in any event you're going to need more than a pack of 7 knives. Don't get me wrong those look useful and everything but I'd rather have a means of purifying drinking water.
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