Deer Cave is absolutely massive. Marketing folks at the Mulu tourism board like to say you could put an entire fleet of 747s inside the cave, and it’s true! If you look closely, you can see two people staring at the bat poo on the boardwalk near the bottom of the beam of light (there are over a dozen different species of bats in the cave, and several bird specifies). That’s one big cave!
Interestingly, the name of the cave is from the deer that used to come into the cave. They are gone now because of the visitors, but the name stuck.