Diu Diu Cave is a karst cave located in Waigani, Milne Bay Province, Papua New Guinea.
Traversing through the cave is very difficult; it involves wading through mud and guano with a low ceiling that at times dips to 80cm clearance.
The cave is home to a population of blind cave eel, cave prawn, cave spiders and various species of bats, including flying foxes.
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