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Tourist boats in the crystalline blue waters of Melissani Lake cave, Kefalonia, Ionian Islands, Greek Islands, Greece, Europe

Local schoolchildren in blue and white school uniform visiting Ranigumpha, cave number 1, Udayagiri caves, Bhubaneshwar, Orissa, India, Asia

Iceberg detail in and around the Antarctic Peninsula during the summer months. More icebergs are being created as global warming is causing the breakup of major ice shelves and glaciers.

Iceberg detail in and around the abandoned British research base "W" in Crystal Sound near the Antarctic Peninsula

Iceberg detail in and around the Antarctic Peninsula during the summer months. More icebergs are being created as global warming is causing the breakup of major ice shelves and glaciers.

Safe trail path along the cliff of the Ebenalp between the Wildkirchli caves and Aescher mountain restaurant, Canton Appenzell-Innerrhoden, Switzerland, Europe

The Aescher mountain restaurant near the Wildkirchli caves below the Ebenalp cliff, Canton Appenzell Inner Rhodes, Switzerland, Europe

The Aescher mountain restaurant near the Wildkirchli caves below the Ebenalp cliff, Canton Appenzell Inner Rhodes, Switzerland, Europe

The Aescher mountain restaurant near the Wildkirchli caves below the Ebenalp cliff, Canton Appenzell Inner Rhodes, Switzerland, Europe

Glacial cave in the Vatnajoekull glacier near the Kverkfjoell mountain range, Highlands of Iceland, Iceland, Europe

The lime kiln building at the Monsted, Monsted Limestone Caves near Viborg, Jutland, Denmark, Europe

Blue glacial ice is exposed inside an ice cave at the terminus of Mendenhall Glacier, Mendenhall Lake, Tongass National Forest, Alaska, United States of America

A tight squeeze for travelers exploring New Zealand's famous Franz Josef Glacier, iwth its blue Ice, deep crevasses, caves and tunnels that mark the ever changing ice formations; West Coast, New Zealand

Travellers explore New Zealand's famous Franz Josef Glacier. Blue Ice, deep crevasses, caves and tunnels mark the ever changing ice; West Coast, New Zealand

Travellers explore New Zealand's famous Franz Josef Glacier. Blue Ice, deep crevasses, caves and tunnels mark the ever changing ice; West Coast, New Zealand

Travelers entering an ice tunnel while exploring the famous Franz Josef Glacier with its, blue ice caves, deep crevasses and tunnels that mark the ever changing ice formations; West Coast, New Zealand

Travellers explore New Zealand's famous Franz Josef Glacier. Blue Ice, deep crevasses, caves and tunnels mark the ever changing ice; West Coast, New Zealand

Travellers explore New Zealand's famous Franz Josef Glacier. Blue Ice, deep crevasses, caves and tunnels mark the ever changing ice; West Coast, New Zealand

Travelers exploring the famous Franz Josef Glacier with its, blue ice caves, deep crevasses and tunnels that mark the ever changing ice formations; West Coast, New Zealand

Diver and a school of Dusky batfish (Platax pinnatus) at the entrance to a cavern with alcyonarian coral off the island of Gato, Bohol Sea, Philippines

Diver and schooling Yellowfin Goatfish (Mulloidichthys vanicolensis). This species turns red at night and when they are in caves during the day, Kauai, Hawaii, United States of America

Diver at one of the many openings around the dive site called First Cathedral off the island of Lanai, Hawaii, United States of America

Diver outside of the dive site called First Cathedral off the island of Lanai, Hawaii, United States of America

Diver inside a cavern known as First Cathedral off the island of Lanai, Hawaii, United States of America

Water cascades over rocks inside a cave beneath the ice of Root Glacier in Wrangell-St. Elias National Park; Alaska, United States of America

Australia, New South Wales, Jenolan Caves, Blue Lake, Car on road at shore of lake among forest covered slopes

Tek (Trimix) speleologist diver in a karstic underwater cave over 70 meters deep, Photogrammetry, twiglight zone, Mayotte

Cave diver in an underwater cave of karstic origin at a depth of 75 meters during the Gumbo La Baharini 2 expedition, which aimed to produce a complete 3D model of this karstic cave using photogrammetry. Passe Bateau Sud, Mayotte lagoon

Cave diver in a karst underwater cave at a depth of 60 metres for the Gumbo La Baharini 2 expedition, Passe Bateau Sud at a depth of 60 metres, Mayotte