I glance at my guide, Brian Kakuk—one of the world's foremost cave divers ... exist in pockets of liquid water deep beneath the surface of Mars or in a sea under the frozen crust of Jupiter's ...

Besides the beaches, The Crystal Caves are one of Bermuda’s most beautiful ... Check out the most stunning deep-sea sights ever discovered. Located inside the Phong Nha-Ke Bang National Park ...

The caves covered in crystal formations surround a 55-foot deep lake. Today, bridges run throughout the caves allowing visitors to descend deep into the darkness and witness the magnificent beauty ...