– Breaking Defense – Polar bears. Wind chill of 20 below. Ice floes drifting faster than ever thanks to global warming. Cutting holes in the ice big enough to drop unmanned mini-subs through. Keeping mini-drones aloft in the frigid winds to watch out for the aforementioned bears. Those are just some of the issues — many of them new — that Navy sailors face as they set up camp for Ice Exercise 2016.