"The poisonous gas in the valley, if my judgment is correct, should be hydrogen sulfide, a highly toxic, flammable gas. When the concentration is high, it smells like rotten eggs; when low, it should smell like sulfur." Returning to the camp, Perfikot gathered everyone and explained her findings: "This sulfide is deadly and dangerous. When mixed with air, it forms an explosive mixture that can blow up the entire valley when ignited.
Moreover, exposed to the valley's concentration, it will cause pulmonary edema in a few minutes, invade the nervous system, causing breathing difficulties leading to death.
Therefore, without my permission, no one is allowed within five kilometers of the valley, nor is open flame allowed. Anyone who violates this will be cemented into a stone warning marker for a hundred years! Do you all understand?"
Perfikot emphasized solemnly, seeing her seriousness, everyone hurriedly assured that they understood.
