1116-41771 - Male caver climbing a rope to exit a cave, Crowsnest pass alberta canada

1116-41772 - Two female cavers exploring a cave ice-plug, Crowsnest pass alberta canada

1176-867 - Cavers in Hang Roc (Ruc Mon) cave in Phong Nha, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia

1176-863 - The illuminated interior of Paradise Cave in Phong Nha Ke Bang National Park, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia

1176-860 - Hikers in the interior of Galaxy cave on the Ben Dang River in Thien Ha, Ninh Binh, Vietnam, Indochina, Southeast Asia, Asia

1176-864 - The illuminated interior of Paradise Cave in Phong Nha Ke Bang National Park, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia

1218-488 - Cavers shining lamps on bats in Pokhara Bat Caves, Pokhara, Nepal, Asia

857-86805 - A caver is dwarfed by massive stalagmites in Hang Son Doong. Light can be seen coming in in the distance through the frist doline which is over 3 km away. Hang Son Doong is located in Phong Nha Ke Bang National Park, Vietnam.

857-86797 - A caver stands in a sunbeam coming through an entrance to Hang En Cave in Phong Nha Ke Bang National Park, Vietnam. This natural phenomenon occurs only in the months of December and January.

857-86798 - A caver stands in a sunbeam coming through an entrance to Hang En Cave in Phong Nha Ke Bang National Park, Vietnam. This natural phenomenon occurs only in the months of December and January.

857-58607 - The Underworld - Photographs from caves all over the world

857-58604 - The Underworld - Photographs from caves all over the world

857-58673 - The Underworld - Photographs from caves all over the world

857-58611 - The Underworld - Photographs from caves all over the world

857-58603 - The Underworld - Photographs from caves all over the world

857-58669 - The Underworld - Photographs from caves all over the world

857-58584 - The Underworld - Photographs from caves all over the world

857-58646 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58655 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58675 - The Underworld - Photographs from caves all over the world

857-58657 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58624 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58626 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58636 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58628 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58635 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58634 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58677 - The Underworld - Photographs from caves all over the world

857-58672 - The Underworld - Photographs from caves all over the world

857-58656 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58649 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58580 - The Underworld - Photographs from caves all over the world

857-58609 - The Underworld - Photographs from caves all over the world

857-58676 - The Underworld - Photographs from caves all over the world

857-58630 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58659 - The giant caves of Mulu National Park, Sarawak, Borneo, Malaysia

857-58588 - The Underworld - Photographs from caves all over the world

857-58623 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58642 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58654 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58638 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58631 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58602 - The giant caves of Mulu National Park, Sarawak, Borneo, Malaysia

857-58582 - The Underworld - Photographs from caves all over the world

857-58605 - The Underworld - Photographs from caves all over the world

857-58625 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58658 - The giant caves of Mulu National Park, Sarawak, Borneo, Malaysia

857-58622 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58650 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58608 - The Underworld - Photographs from caves all over the world

857-58639 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58601 - The giant caves of Mulu National Park, Sarawak, Borneo, Malaysia

857-58651 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58597 - The giant caves of Mulu National Park, Sarawak, Borneo, Malaysia

857-58678 - The Underworld - Photographs from caves all over the world

857-58647 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58581 - The Underworld - Photographs from caves all over the world

857-58641 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

857-58633 - The Underworld - Photographs from a very famous European cave called The Gouffre Berger, in France

911-5425 - A caver in Easegill Caverns in the Yorkshire Dales, Yorkshire, England, United Kingdom, Europe

911-5426 - A caver in Kingsdale master cave, Yorkshire Dales, Yorkshire, England, United Kingdom, Europe

911-3273 - A caver in the Yorkshire Dales, Yorkshire, England, United Kingdom, Europe

911-5463 - A caver in Kingsdale master cave, Yorkshire Dales, Yorkshire, England, United Kingdom, Europe

911-5428 - A caver in Kingsdale master cave, Yorkshire Dales, Yorkshire, England, United Kingdom, Europe

911-5427 - A caver in Kingsdale master cave, Yorkshire Dales, Yorkshire, England, United Kingdom, Europe

911-3265 - A caver in a tight squeeze in the Yorkshire Dales, England, United Kingdom, Europe

911-3262 - A man exploring the old abandoned Coniston copper mines in the Lake District, Cumbria, England, United Kingdom, Europe

911-3263 - A caver in Valley Entrance, Kingsdale, Yorkshire Dales, Yorkshire, England, United Kingdom, Europe

911-3247 - A caver in the Yorkshire Dales, Yorkshire, England, United Kingdom, Europe

29-594 - Lake of the Clouds, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America