Ice and Sea Residual Temperature

In the year 2126 AD, the greenhouse crisis ignited by humans has backfired in a cruel and absurd way. The polar glaciers completely collapsed within three months, and massive amounts of fresh water poured into the oceans. Immediately afterwards, the global temperature plummeted. From the equator to the poles, the land was covered with thousands of meters of ice, and the ocean surface condensed into endless ice caps, leaving only the deep sea area with a trace of unfrozen life. This is not a slow death, but a sudden suffocation - when the last rescue helicopter crashes into the ice crevice, when the last ground base is pierced by the ice edge, the fire of human civilization is left with only a few refuge cabins hidden in the deep sea, lingering in the darkness and high pressure.