Jump to content
Your browser is out of date. It has known security flaws and may not display all features of this websites. Learn how to update your browser[关闭]
嵌入代码

Hölloch是瑞士最长,也是西欧最长的溶洞。神秘莫测的溶洞吸引着人们去研究、去探险…

Hölloch溶洞已被测量的距离为197公里,是整个欧洲第二长的溶洞,它每年的研究范围都会向前再推进700到1000米。