 While initially the idea of ordering two similar but technically different series of ships for the same purpose was to gain operational experience for the future arctic freighters, shortly after the deal was made public the shipyards approached Sudoimport to agree on a uniform design, resulting in a class of sub-arctic 15,000 DWT cargo ships, the SA-15 class.After the initial series Valmet received another follow-up order for five ships of slightly different design, sometimes referred to as the SA-15 Super class due to the minor improvements based on the operators' experiences in the arctic.