The cave Queen of the dead men

The cave «Queen of the dead men».
One of the most enigmatic, mystical underwater caves of China is located in Guangdong province.

Well of the cave is a hourglass – the wide bowl narrows at a depth of approximately 18 meters, and then expanded again. The depth of the well is 38-45 meters (depends on season and water level). From the well you can go on a wide, almost horizontal passageway. After 10 -15 m there is another large room, which going down. The depth of the second hall is 60-70 meters, its size is several times larger than the first. In the dry season the visibility is 30 meters, however in the rainy season may drop to 5. The water is warm all year round, it does not fall below 20 degrees.
In the picture on right is the bottom of the well, then the passage to the main hall, and the main hall with the mark of the deep. Question marks in the diagram mark unexplored corridors that go from the main hall.