the arktika is a double-hulled icebreaker; the outer hull is 48 mm (1.89 in) thick, the inner 25 mm (0.98 in) thick, with the space in between utilized for water ballasting. at the strongest point, the cast steel prow is 50 cm (19 ¾ in) thick and bow-shaped to aid in icebreaking, the curve applying greater dynamic force to fracture the ice than a straight bow would.
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