Son Doong - The world's biggest cave found

Son Doong, the world's biggest cave is found in Vietnam. The world largest single cave passage is in the Vietnamese jungle. It has broken the previous world record set by The Deer cave which is in Malaysia. The Deer cave is 300 feet wide but only a mile long.

The explorers have been able to explore 2.8 miles of Son Doong cave before they were unable to go any further as they were blocked by flood water. The cave is even longer