Guardian: The open deck of the Aurora fills as soon as its captain, Keiichi Hori, announces he has spotted ice. Cameras primed, groups of elderly tourists jostle for position as the telltale white line in the distance slowly morphs into a carpet of sea ice. As the bow of the ship meets the ice, they struggle to hide their disappointment. Viewed from the deck, the frozen layers below appear wafer thin and barely raise a crackle as the Aurora slips through, emerging into clear water only minutes …