Simud Putih
Simud Putih (White Cave) is the larger of the two caves, and also the more dangerous; special permission is required to enter and one must participate in at least five hours of intense spelunking. It is where the more valuable "white saliva" nests of the swiftlets are found, and is a steep 30 minute climb further up the mountains. The main entrance is located almost 90m above Simud Hitam.
Read more about this topic: Gomantong Caves