Approximately 20 years ago, a farmer heard a loud whistling sound from the direction of the forest. After the pan sound was coming from a small gap that proved to be the entrance to a cave that the river flowed under it. The cave is now known by the name Hang Son Doong (Mountain River Cave) was not touched up when a group of British explorers who accompanied investigators from the Hanoi University of Science entered at the beginning of the year 2009. They found a "room" (Cave Chamber), the largest in the world. The main point in the room was high with a width of 198 meter and 152 meter length of approximately 4.5 KM. Seasonal floods that come every year to stop the adventurers to explore further.
In addition to flooding the team also had to deal with a poisonous centipede species exist only in the area.
A lake also were found in the cave was the depth reaches 61 M based on the size of the longest string in the team had to dig for water depth. Hang Son Doong is one among dozens of the largest caves found in the national park Phong Nha - Ke Bang discovery shifts the position of "cave stag" in Malaysia which has a size 91 M x 91 M from the top of the world's largest cave. However, Vietnam's position may not last long because the latest satellite images showed the presence of a number of areas more extensive caves in the vicinity of the Amazon.
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