Given the technology of the day, could WW2 submarines travel under the polar ice cap and surface through the ice to recharge batteries? Japan in particular build some pretty large submarines with impressive endurances. I don't imagine this would radically change the course of the war, but Germany and Japan sent submarines back and forth during WW2 to exchange technology, so there would be a niche for a sub with these capabilities. Going underneath the pole would be shorter as the crow flies, and presumably risk fewer attacks. Thoughts?