Therese Madden, third from left, in Viogelmir, a lava tube cave in Iceland.(特蕾澤梅登，左起第三個，在Viogelmir，冰島的一個熔巖洞。)

They confront boiling lava pits, hidden ice cave, cold weather, and a secret, even evil conspiracy.(他們勇敢地面對沸騰的熔巖坑、暗藏的冰穴、嚴寒的天氣，以及一個秘密，甚至是邪惡的陰謀。)

There were large lava rocks scattered here and there and a small scoop of a cave off to the right.(巨大的火山熔巖散落在附近，在右邊有一個極小的山洞。)

In the scenic area there is an exotic and beautiful underground cave which is called white cloud cave or crystal palace and is belonged to underground lava topography.(景區內還有神奇瑰麗的地下溶洞，人們稱之為白云洞或水晶宮，屬地下巖溶地貌。)

While I was braving the rain to explore the area, I came upon a lava cave.(當我冒雨探索這個區域時，碰上了一個熔巖洞穴。)

Within these insulated underground passages the molten lava can continue to flow for many miles, until the source of the lava gets cut off, leaving behind a 'cave.(在這些絕緣地下通道，熔巖流能夠繼續對許多英里直到熔巖源，獲取切斷，留下了'離開洞穴。)