Sunny Priyan
It's located in the western Pacific Ocean, plunges approx 11,000 meters deep, and includes 'bioluminescent' creatures which thrive in complete darkness.
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These hidden caves are formed by volcanic heat under the ice of Mount Erebus, with temperatures that can trap life and secrets beneath the surface.
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Mammoth Cave is an underground maze where echoes replace sunlight. It spans over 400 miles and has never seen light.
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It has its own weather and ecosystem, and parts of this cave are in absolute darkness, hiding entire unexplored sections.
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These vents are located miles beneath the ocean surface in complete darkness. They rely on chemosynthesis instead of sunlight.
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A dark maze filled with millions of bones lies deep under the city's charming streets, where time and light vanish.
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