When the Sun went out

As the Sun dies, a dwindling human population confronts failing machines, encroaching ice, and the prospect of permanent darkness. Scientists who have monitored the waning star urge mass migration into vast caverns being excavated beneath the Earth's crust; engineers repurpose old machinery to bore shafts, line chambers with a glass-like material called Ega, and create communal subterranean settlements. The narrative follows tensions between resignation and renewed ingenuity, chronicling technical obstacles such as underground rivers and sinkholes, and the cautious hope that human skill can sustain a remnant population as surface life becomes uninhabitable.