Mid-August. It is hot and sunny outside every day. In principle, the usual weather for summer. But on the 15th, forecasters suddenly announce that there will be a sharp abnormally cold snap. The temperature during the day will not exceed 10-15 degrees! A very strange phenomenon, but almost no one was worried. "Soon it will be warm again," everyone said. However, a few weeks passed, but the heat was gone. On the contrary, it was getting colder every week. Already in early September, the weather was quite harsh. At night it reached -2 degrees, during the day no more than 10. Slowly but surely, the days became gloomier, and the nights became anxious...

One cloudy September day, a strong and cold wind suddenly blew. It was icy, prickly, howling. A cold wind swept over Anna. The frost climbed under his jacket and touched his soul. Anna shuddered. She was on her way home after training. Finally, when she arrived, her parents met her. They, without explaining anything to her, told her to pack her things for the trip. By evening they were ready, only then did her father tell her that they were leaving Moscow and going south, where my father was appointed chief engineer for a special facility.

A day later, they reached a small settlement. Work was in full swing there. The focus was on a huge regular round hole in the ground. Construction machines, warehouses with resources and many workers and engineers were concentrated around it. Her father told Anna that they were going to build one of the 4 southern heat generators here. "They say that there will be a harsh winter. One that no one has seen before. The government is afraid that this winter could drag on for a long time."

Anna and her family were approached by a young one, apparently an engineer. "You've finally arrived! We have been waiting for you, we have a lot of work and little time," the engineer said. Anna agreed, but confused. "Are we going to help with that?" She asked. The engineer nodded with certainty. "Oh.. Are we going to start now or?" She looked around. They are building a heat engine to warm residents during the winter.