Deep in the Romanian forest, a team of scientists stumbles upon the ruins of a 13th century Abbey which is built over the entrance to a giant underground cave system.

• 在罗马尼亚的森林深处，科学家们发现13世纪古老大宅的地底下，竟埋藏著一个超大型地底洞穴，他们聘请了一队洞穴探险家，进入洞穴查探究竟。