Nuclear powered icebreaker is a ship built to be used in the waters frozen throughout the year. They are much more powerful than diesel ones and can conquer frozen waters easier. And they do not need refuelling. There were only ten nuclear powered icebreakers in the world, all of them were built and put afloat on the territory of the USSR and Russia. They proved to be irreplaceable in 1983 when 50 ships including some diesel ones were trapped in the ice in thу east Arctic. Only
with help of the nuclear powered icebreaker "Arctic" they managed to get out of the ice captivity and delivery the cargo to the nearest settlements. The world biggest icebreaker is "The 50th Victory Anniversary" that was made in 1989 in Leningrad. It was not finished then, its construction was postponed until 2003, only in 2007 it started to be tested in the Gulf of Finland. When the tests were over it was sent to the city of Murmansk.