《徐霞客游记·滇游日记十六》
穿进其深窟，正好位于礼佛台之下，深窟是外石靠近内石而形成的，上连下开，裂缝穿透两头。
穿其奥窟，正当佛台之下，乃外石之附内石而成者，上连下迸，裂透两头。
Entering the deep cave, it is just situated below the Lifotai, and the deep cave is formed by the outer rock pressing against the inner rock, with its top connected to the sky and its bottom open, and the cracks pass through both ends.
<s>[INST] Kindly elucidate the central themes in this passage in English: 穿其奥窟，正当佛台之下，乃外石之附内石而成者，上连下迸，裂透两头。 [/INST] Entering the deep cave, it is just situated below the Lifotai, and the deep cave is formed by the outer rock pressing against the inner rock, with its top connected to the sky and its bottom open, and the cracks pass through both ends.</s>
Kindly elucidate the central themes in this passage in English: 穿其奥窟，正当佛台之下，乃外石之附内石而成者，上连下迸，裂透两头。
user
Entering the deep cave, it is just situated below the Lifotai, and the deep cave is formed by the outer rock pressing against the inner rock, with its top connected to the sky and its bottom open, and the cracks pass through both ends.
assistant