This episode reveals the engineering breakthroughs behind the Arctic's biggest icebreaking ship - the oil tanker Timofey Guzhenko. Weighing in at over 93 thousand tonnes, the Timofey Guzhenko is by far the biggest icebreaking ship to operate in the Arctic Ocean. It can smash through solid ice a meter and half thick and pulverize blocks of ice the size of a car with its huge propellers. But the Timofey Guzhenko wasn't designed and built in a day. It stands on the shoulders of historic engineering achievements that have allowed it to grow so big. This film charts the stories of four historic inventions, embodied by landmark machines - giants of the ice.

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Documentary