The Son Doong Cave has a total length of nearly 9 km and the volume is up to 38.5 million cubic metres, which makes this cave the largest natural cave on the planet. With this volume, Hang Son Doong is 5 times larger than Deer Cave in Malaysia, which was said to be the largest natural cave ( before Hang Son Doong was discovered) with 9.5 million cubic metres of volume. However, what makes Son Doong special, recognized, and well-known by the world is the unique hidden underground world inside the cave itself. ⁠ ⁠ It has many complex and giant stalactites (over 80m high), primaeval rain forests growing inside the cave, its own ecosystem, weather, and a mysterious underground river that no explorer has yet discovered to the end of it. Many visitors admitted that the Hang Son Doong Cave is like another world. Ginger Zee from ABC News's Good Morning America exclaimed that the scenery in Son Doong was like that in the Avatar movie.⁠ ⁠ ⁠ ⁠ #cave #hangsondoong #vietnam #science