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During 1970/71, the Norvegian Aker Group studied concepts for an icebreaking tanker with the capability of year round operation under Artic conditions. Three concepts were considered: a conventional hull icebreaker (IBT) and a couple of semi-sumersible concepts (SSIT).
Source: Aviation & Marine magazine April 1976 issue.
Source: Aviation & Marine magazine April 1976 issue.