The scientific term for what was brewing was a limbic eruption. It was a rare, terrifying possibility that most geologists had only theorized about in textbooks. As the density of the carbon dioxide-rich water reached a critical level, it was no longer a stable layer; it was a loaded spring. A single catalyst, perhaps a minor landslide from the crater walls, a subtle shift in the lake bed, or even a sudden change in the water’s internal temperature, could disrupt the delicate balance of the stratification. If the heavy, gas-laden water were to be stirred, the dissolved gas would suddenly, violently, begin to come out of solution, much like the bubbles in a shaken bottle of soda.
The scale of the potential disaster was difficult to grasp. Unlike a volcanic eruption that sends ash and lava flying through the air, a limbic eruption is an invisible killer. The gas would not explode with fire, but it would expand with terrifying speed. A massive plume of carbon dioxide, significantly denser than the surrounding atmosphere, would roll out of the crater and pour down the mountainsides like a slow-moving, ghostly tide. It would seek out the low-lying valleys, the very places where the villages of NGOs and Cha were nestled, and it would settle there, filling every crevice, every home, and every lung.
On that fateful evening, the atmospheric pressure began to drop. The air felt thick, almost suffocating, even for those not standing near the shoreline. In the village of NGOs, families were settling in for the evening, unaware that the very air they were breathing was being silently replaced by an odorless predator. There was no roar of thunder to warn them, no flash of lightning to alert them. There was only the deepening shadow of the crater and an unsettling stillness that felt less like peace and more like a held breath.
As the sun dipped below the horizon, the chemical composition of the air near the ground began its fatal shift. The concentration of CO2 was climbing, creeping upward through the layers of the atmosphere. It was a slow-motion catastrophe, a disaster that was already in motion, even as the world remained oblivious. The threshold was being approached, and once it was crossed, there would be no way to stop the descent of the invisible tide.
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