It's an adventure that demands explorers spend their time in the cold, wet and dark.
But for those who persevere, the results are certainly worth it.
A French-Swiss team have made it their mission to explore a huge network of chambers and sinkholes beneath the Nakanai Mountains of New Britain, in Papua New Guinea.
And for those who thought it was just the lush mountains and forest of the country that were beautiful, think again.
A caver stands in a chamber of stalagmites in New Britain, Papua New Guinea
Deeper underground: A man stands in a white chamber observing the stalagmites in the yawning cave
A team of cavers step through the water in a cave as they explore the networks beneath the forest
Is anybody there? The team are on a mission to explore the miles of chambers and sinkholes
Don't look down: A caver abseils above a pool of water in a cave, watched by French photographer Philip Bence, who described it as an 'incredible and unforgettable adventure'
One caver prepares for the next part of the expedition - plunging into col water, as the team delve deeper into the underworld
Into the wild: A caver stands in a dark cave s they descend into the unexplored darkness
Head for heights: The team begin their long descent into the caves which stretch for miles in the beautiful country
Using ropes, a man abseils down a white chamber in the cave network, as the team discovers the extent of the underground network
Peekaboo: This tiny mammal with its huge curious eyes is capture on camera in the pitch black cave
Waving goodbye to daylight: A caver prepares to drop into the cave network which remains largely unexplored
Read more:
http://www.dailymail.co.uk/news/article-2233207/Underworld-wonder-The-stunning-network-chambers-caves-beneath-Papua-New-Guinea-mountains.html#ixzz2Zhn0jHpl
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