照片摄于十月份，这是通向莫蒂默洞穴的正面入口(图片下方中部)，诺丁汉城堡的另一个地下洞穴通道，从宫殿向下延伸。
Pictured in October, the foreboding entrance to Mortimer's Hole (bottom center), another cave passage beneath Nottingham Castle, beckons downhill from the palace itself.
一项最新勘探结果显示，最近在越南偏远丛林地区发现的一个大型洞穴是迄今为止发现的世界上最大的单个洞穴通道。
A recent exploration results show that in remote jungle areas in Vietnam has recently found a large cave so far discovered in the world's largest single cave passage.
水井穿过狭窄的通道，最终进入一个巨大的洞穴。
Wells clawed through narrow passages, and eventually into a huge chamber.
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