During the day, the interior of the shelter located halfway up the mountain is always pitch black.
When constructing it, neither Chen Zhou nor Paul considered leaving a window; they couldn't afford a big ventilation opening, nor did they have glass to let light through.
If they wanted the house to be brighter, they could only move the heavy wooden door at the entrance.
At that point, sunlight could shine into the house, but the hard-earned warmth inside would be scattered by the cold wind, and once the sun set, after returning from work, both the bed and walls would be as cold as an ice cellar.
Therefore, once Paul got up in the morning and went out to work, he would block the entrance with the wooden door to prevent the escape of warmth.
After completing gene modification, his cold resistance had greatly improved. Coupled with the Slavs' natural adaptation to Northern Siberia's frigid climate, the present cold didn't bother him much; it just exacerbated food consumption.
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