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Columnar basalt lava with Fingal's Cave cut into it by sea, Staffa, off west coast of Mull, Inner Hebrides, Scotland, United Kingdom, Europe
Free diving in a cave off Espanola Island, Galapagos, Ecuador, South America
Free diving in a cave off Espanola Island, Galapagos, South America
The gigantic Gruta de Benagil sea cave (Benagil Cathedral), Algarve, Portugal
The sea caves of Benagil with natural windows on the clear waters of the Atlantic Ocean, Faro District, Algarve, Portugal, Europe
Karst Cave at Xinwen Stone Sea Global Geo Park, Sichuan Province, China, Asia
A tourist inside the sea caves of Benagil admires the clear waters of the Atlantic Ocean, Faro District, Algarve, Portugal, Europe
Basalt columns next to Fingal's Cave on the Isle of Staffa, with Mull in the background, Inner Hebrides, Scotland, United Kingdom, Europe
View of basalt columns in Fingal's Cave on the isle of Staffa, Inner Hebrides, Scotland, United Kingdom, Europe
The gigantic Gruta de Benagil sea cave (Benagil Cathedral), Algarve, Portugal
The mouth of Fingal's Cave, Staffa Island, with Mull in the distance, Inner Hebrides, Scotland, United Kingdom, Europe
Coral substrate forming an underwater cave, Ras Mohammed National Park, Sharm El Sheikh, Red Sea, Egypt, North Africa, Africa
Excursion boat to the caves at Ponte da Piedade near Lagos, Algarve, Portugal, Europe
The Blue Grotto natural sea arch and cliffs, Wied iz-Zurrieq, Malta, Mediterranean, Europe
Cave of Poetry (Grotta della Poesia), Roca Vecchia, Lecce, Salento, Apulia, Italy
Cave of Poetry (Grotta della Poesia), Roca Vecchia, Lecce, Salento, Apulia, Italy
Cave of Poetry (Grotta della Poesia), Roca Vecchia, Lecce, Salento, Apulia, Italy
Cape Greco, Protaras, Cyprus, Mediterranean, Europe
Scuba Diver explores Cave, North Male Atoll, Maldives
Torghatten granite mountain with a hole through it, Torget island, Bronnoy, Nordland county, Norway, Scandinavia, Europe
Cliff top watch tower, Comino island, Malta, Mediterranean, Europe
Karst Cave at Xinwen Stone Sea Global Geo Park, Sichuan Province, China, Asia
Sunset on Railay Beach in Krabi, Thailand, Southeast Asia, Asia
Soft Corals in Overhang, Chironephthya sp., Felidhu Atoll, Maldives
Scuba Diver explores Cave, North Male Atoll, Maldives
Cliff top watch tower, Comino island, Malta, Mediterranean, Europe
Crab Larvae in Indian Ocean, Underwater Cave, Gecarcoidea natalis, Christmas Island, Australia
Scuba Diving in Mbuco Caves, Marovo Lagoon, Solomon Islands
Cliff top footpath at Ajuy, Fuerteventura, Canary Islands, Spain, Atlantic, Europe
Scuba Diving in Mbuco Caves, Marovo Lagoon, Solomon Islands
Scuba Diving in Bat Caves, Russell Islands, Solomon Islands
Black sand beach at Ajuy, Fuerteventura, Canary Islands, Spain, Atlantic, Europe
Divers preparing for dive in the grotto collapsed cave on Saipan, Northern Marianas, Central Pacific, Pacific
Scuba divers in underwater cave, Southern Thailand, Andaman Sea, Indian Ocean, Asia
Caves of Qumran in the Judean Desert, near the Dead Sea, Israel, Middle East
Scuba Diving in Bat Caves, Russell Islands, Solomon Islands
Cave diving, Southern Thailand, Andaman Sea, Indian Ocean, Southeast Asia, Asia
Scuba Diving in Custom Caves, Russell Islands, Solomon Islands
Scuba Diver explores Cave, North Male Atoll, Maldives
Scuba Diving in Custom Caves, Russell Islands, Solomon Islands
Crab Larvae in Indian Ocean, Underwater Cave, Gecarcoidea natalis, Christmas Island, Australia
Scuba Diver explores Cave, North Male Atoll, Maldives
Scuba Diver explores Cave, North Male Atoll, Maldives
Koh Nok, Pranang Cave Beach, Rai Leh (Railay), Andaman Coast, Krabi Province, Thailand, Southeast Asia, Asia
Scuba diver in Cave, Raja Ampat, West Papua, Indonesia
Crab Larvae in Indian Ocean, Underwater Cave, Gecarcoidea natalis, Christmas Island, Australia
Scuba Diver inside Green Cave, Vis Island, Mediterranean Sea, Croatia
Scuba Diver inside Green Cave, Vis Island, Mediterranean Sea, Croatia
Scuba Diving in Mbuco Caves, Marovo Lagoon, Solomon Islands
Scuba Diving in Bat Caves, Russell Islands, Solomon Islands
Scuba Diver inside Green Cave, Vis Island, Mediterranean Sea, Croatia
Scuba Diver inside Cave, Cave Reef, Red Sea, Egypt
Scuba Diver inside Green Cave, Vis Island, Mediterranean Sea, Croatia
Scuba Diver inside Cave, Cave Reef, Red Sea, Egypt
Scuba Diver explores Cave, North Male Atoll, Maldives
Talava Arches, Niue, South Pacific, Pacific
Scuba Diver inside Cave, Zabargad, Red Sea, Egypt
Scuba Diver inside Cave, Cave Reef, Red Sea, Egypt
Scuba Diver inside Cave, Paradise Reef, Red Sea, Egypt
Scuba Diving in Mbuco Caves, Marovo Lagoon, Solomon Islands
Scuba Diver inside Cave, Pseudanthias squamipinnis, Paradise Reef, Red Sea, Egypt
Cave of Byron, Portovenere, Liguria, Italy, Europe
Scuba Diver inside Cave, Cave Reef, Red Sea, Egypt
Scuba Diver inside Cave, Cave Reef, Red Sea, Egypt
Scuba Diver inside Cave, Zabargad, Red Sea, Egypt
Island Ravnik and Green Cave, Mediterranean Sea, Croatia
Scuba Diver inside Cave, Cave Reef, Red Sea, Egypt
Scuba Diver inside Cave, Cave Reef, Red Sea, Egypt
Scuba Diver inside Cave, Cave Reef, Red Sea, Egypt
Scuba Diver inside Cave, Zabargad, Red Sea, Egypt
Tourist boat at Papanikolis Cave, Meganisi, Ionian Islands, Greek Islands, Greece, Europe
Scuba Diver inside Cave, Zabargad, Red Sea, Egypt
Scuba Diver inside Cave, Cave Reef, Red Sea, Egypt
Scuba Diver inside Cave, Zabargad, Red Sea, Egypt
Scuba Diver inside Cave, Zabargad, Red Sea, Egypt
Scuba Diver inside Cave, Zabargad, Red Sea, Egypt
Scuba Diver inside Cave, Zabargad, Red Sea, Egypt
Scuba Diver inside Cave, Cave Reef, Red Sea, Egypt
Scuba Diver inside Cave, Cave Reef, Red Sea, Egypt
Scuba Diver inside Cave, Cave Reef, Red Sea, Egypt
Scuba Diver inside Cave, Pseudanthias squamipinnis, Paradise Reef, Red Sea, Egypt
Scuba Diver inside Cave, Paradise Reef, Red Sea, Egypt
Scuba Diver inside Cave, Paradise Reef, Red Sea, Egypt
Scuba Diver inside Cave, Zabargad, Red Sea, Egypt
Scuba Diver inside Cave, Cave Reef, Red Sea, Egypt
Scuba Diver inside Cave, Cave Reef, Red Sea, Egypt
Scuba Diver inside Cave, Cave Reef, Red Sea, Egypt
Scuba Diver inside Cave, Cave Reef, Red Sea, Egypt
Phnanang Beach, Krabi, Thailand, Asia
The Grotto, Port Campbell, Great Ocean Road, Victoria, Australia
Smoo Cave, Durness, North West Highlands, Scotland, United Kingdom, Europe
Smoo Cave, Durness, Northwest Highlands, Scotland, United Kingdom, Europe
Sarakiniko volcanic rock formations at sunset, island of Milos, Cyclades, Greek Islands, Greece, Europe
Dusk lights over Manarola seen from a sea cave, Cinque Terre, UNESCO World Heritage Site, La Spezia province, Liguria, Italy, Europe
Snorkelers swim above a blue hole on Palau's barrier reef. This hole formed when sea level was much lower than it is today.
Rocky cliffs of Shpella e Pirateve tourist attraction, Albania, Europe
An adult American Eel (Anguilla rostrata) prowls along the edge of the Morrison Springs cavern at 85 feet deep watching over the adolescent eels in the clear freshwaters of the state park near Red Bay, Florida.
Underwater photographer at the entrance of a cave framed by pink barrel sponges, North Sulawesi, Indonesia.
Castellana caves (Castellana Grotte), Apulia, Italy, Europe
Natural cave formation on a rocky hill with green plantation stretching to the sea, Zakynthos, Ionian Islands, Greek Islands, Greece, Europe