Read the text carefully and answer the questions accordingly. Transporting oil by tankers in the artic sea is mostly carried out by fleets of nuclear ice breakers and relatively small. After the introduction of azipods vessel operating in the ice will be able to transport crude oil without icebreaker asistance new tankers meet all the international requirements related to the safety of navigation and the protection of the marine environment. So ice is still a challenge but not a major problem anymore with the most advanced and unique technical such as azipods.According to passage what makes this ship so unique?