Volcano lava ice cavern, formed mainly because of the different solidifying velocities between surface lava and bottom lava.
火山熔岩冰洞，是由于表层熔岩和底层熔岩的凝固速度不一样而形成。
Five-hour glacier treks bring you up close and personal to the glacier's myriad peaks, fissures and, if you're lucky, the ice cavern the lake hollows underneath, all effusing an ethereal blue glow.
五个小时的艰辛的冰川行走让你近距离的与冰峰冰峡亲密接触，如果你够幸运，可以一访冰洞下的湛蓝，空灵的湖泊。
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