Two underground water pools have been found at Phong Nha Cave, part of a UNESCO World Heritage Site in central Quang Binh province.
The province’s Cultural and Ecological Tourism Center discovered the pools during a survey and exploration trip in the cave on September 26, said Le Thanh Loi, director of the center.
One of the pools covers about 70 square meters, while the other spans more than 300 square meters. They have been found lying around 500 meters apart in an area that is 1,500 meters away from the entrance of the Phong Nha cave.
Divers attempted to explore the depth of the pools, but they failed to reach to their bottoms, Loi said.
There is a possibility that the two pools are connected through an underground river or another cave under the deep sea.
Phong Nha Cave is located in Phong Nha-Ke Bang National Park, a UNESCO World Heritage Site in Quang Binh.
It is 7,729 meters long and contains 14 grottoes, as well as a 13,969 meter underground river.
While scientists have surveyed 44.5 kilometers of passages, tourists are only allowed to explore the first 1500 meters.