Underground in Meghalaya, Krem Chypme (or its Biate name Peilkleing Pouk) is simply one of the finest river caves I have ever seen. There are more than 50 naturally formed dams along its main river passage, the largest of which is 12m (40ft) high. The cave is also home to a giant colony of bats, which roost close to the downstream entrance. They produce guano that feeds cave creatures such as blind fish. In this photograph, several bats can be seen circling high up, whilst the rest hang in the roof.