Madai Cave (Borneo) is a large cave where the Ida'an people collect edible bird's nests.
I suspect that this section of the cave has been closed with metal plates because it is an area of the cave used for burial (something quite common in the Caves of Borneo). But no-one in the cave could speak english, so I was not able to ask. If you know why this part of Madai Cave is closed-off, please post a comment or email me.
View my other photos of the Madai Cave.