The Gomantong Caves in Malaysian Borneo are not a place for the faint of heart.
There are two cave complexes; Simud Hitam or the Black Cave, which soars up to 90 metres high, and Simud Putih or the White Cave.
Those with a high threshold for claustrophobic and dark places infested with creepy crawlies can take a detour from a popular boat ride along the Kinabatangan River to the Black Cave's entrance.