![](http://www.ecns.cn/hd/2019/12/23/adf0f8ab95b6492e85e67cf2262a2545.jpg)
Visitors enter a cave in Lhoong, Aceh province in Indonesia on December 22, 2019. The cave is believed to be about 7,400 years old and holds deposits of previous tsunamis. (Photo/Agencies)
![](http://www.ecns.cn/hd/2019/12/23/2b15471b26e54383958123ef8667dc1b.jpg)
Visitors enter a cave in Lhoong, Aceh province in Indonesia on December 22, 2019. The cave is believed to be about 7,400 years old and holds deposits of previous tsunamis. (Photo/Agencies)
![](http://www.ecns.cn/hd/2019/12/23/7fcf9440f2c249d6afcc920b871cc0fe.jpg)
Visitors enter a cave in Lhoong, Aceh province in Indonesia on December 22, 2019. The cave is believed to be about 7,400 years old and holds deposits of previous tsunamis. (Photo/Agencies)