Borneo0515

The entrance of Gomantong Cave. The brown stuff on the floor is bat and swiftlet poo, several feet thick. The nest harvesters could sell it for fertilizer, but they leave it because it makes a soft landing when they fall off their ladders.
People live in here all year round, to protect their bird's-nest interests. On a good day in the nest-harvesting season, one collector can gather 10,000 ringgits (£1500) worth of nests.
And yes, it stinks.