Deep in the dense forests of Romania, a group of scientists who went on an expedition accidentally discovered the ruins of an ancient temple in the 13th century. After further investigation, they found that the temple was built above the entrance of a huge underground cave. The local biologists believed that there might be some mysterious ecological system hidden in the cave, so they hired a group of American cave explorers to investigate.
Jackand Taylorare a pair of professional cave explorers who love thrills. They recruited the world's top experts and formed an expedition, bringing the most advanced equipment to Romania to conduct surveys. The members of this team also included Charlieand Buchananand others. Soon they started the expedition, but what they never expected was that there was not only hidden in this cave It is a brand-new ecosystem, and a brand-new species is still dormant. Soon, this seemingly exciting adventure turned into an endless nightmare
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