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Heat was the biggest threat to the success of the casting operation. Cold, even the bitter cold of a Baltic winter, was less of a problem once the decision was made to cast all the segments under cover. 'But at peak there would be two segments, each containing 2,700m3 of high cement content concrete, gaining strength inside,' points out 0TC concrete production manager Lars Lundberg. 'That's a lot of concrete, giving off a lot of heat.'