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Initially, everything seemed fine, but as they continued their exploration, rain began to fall above ground, leading to rapidly rising water levels within the cave. Alarmed by the severity of the flooding, the submerged cavers attempted to escape to higher chambers, but the water continued to rise perilously. On the surface, rescuers worked frantically to help the trapped cavers. Unfortunately, despite their efforts, all six cavers drowned; it was later determined that toxic conditions within the cave contributed to the tragedy.