"Not a great deal, I'm afraid." Fancy Pants shrugged. "Comet was not designed to operate this far into the boreal regions. If worse comes to worst, we may have to set down and do what we can to scrape off at least some of it. And hope none of the airscrews throw large chunks against the envelope. Our gas capacity is limited compared to other airships, so we can't afford to lose much of it."