The Cascade Room leads divers deeper into Dan's Cave on Abaco Island.
Great Abaco Island, Bahama Islands.
WES C. SKILES/National Geographic Creative
A diver negotiates the Cascade Room's stalagmites in Dan's Cave.
In Stargate Blue Hole, divers illuminate North Passage.
Andros Island, Bahama Islands.
A diver follows her lifeline through a stalagmite forest in Dan's Cave.
Dean's Blue Hole, Earth's deepest known underwater cave.
Long Island, Bahama Islands.
Divers surface after collecting bacteria samples and fossils.
A dangerous vortex in Chimney Blue Hole off Grand Bahama.
Grand Bahama Island, Bahama Islands.
Divers ascending into the Crystal Palace room of Dan's Cave.
Abaco Island, Bahama Islands.
Divers float thru a cave formation in the Cascade Room in Dan's Cave.
A diver ascends a deep shaft in Dan's Cave on Abaco.
A powerful and dangerous vortex in Chimney Blue Hole.
Divers entering the Crystal Palace room of Dan's Cave.
Divers enter a lower chamber of Dan's Cave.
An inch-long Agostocaris cave shrimp without surface pigmentation.
Poisonous hydrogen sulfide gas swirls within Sawmill Sink Blue Hole.
Divers exit Dan's Cave in Abaco Island.
Mineral formations in Ralph's Cave.
The remipede, a living fossil nearly unchanged for 300 million years.
A blue hole on Abaco Island.
A cave-diver lifts a centuries-old Lucayan Indian skull.
Deposits of reddish brown Saharan dust.
In Sawmill Sink, poisonous hydrogen sulfide gas is present beneath the bacterial layer.
Cave diver holds a prehistoric Cuban crocodile skull in Sawmill Sink.
Free diving into a blue hole on Grand Bahama Island.
An approaching storm turns into a waterspout on Andros Island.
A silt laden room in Iron Cay blue hole.
An anthropologist entering passageway of Iron Cay Blue Hole.
Merideth's Blue Hole on Abaco Island.
Divers in the Magical Mystery Blue Hole.
A cirolanid isopod from Sawmill Sink on Abaco Island.
Divers examine unique micrite deposits in Dan's Cave.
A diver swims through a narrow section in Garbage Hole.
Grand Bahama, Bahama Islands.
In Sawmill Sink, an anthropologist descends through a bacterial layer.
Remepedia, a new class of animal discovered in Bahama's blue holes.
A 3,800 year-old crocodile skull from Sawmill Sink Blue Hole.
Free diving into a blue hole on Andros Island.
A cave-diver in the crystal clear waters of Stargate Blue Hole.
White whisp of sulfur at the hydrogen sulfide layer in Sawmill Sink.
Pre-Columbian skull recovered from a deep blue hole on Andros Island.
An anthroplogist ascending from a siphoning blue hole in Iron Cay.
A diver's tanks are restricted in a Dan's Cave passageway.
Animal fossils in a blue hole.
A scientist uses an inflatable lift bag to bring a stalagmite to the surface.
A diver, forced down by the current, fights to the surface.
Pools of crystal containing pink Saharan dust in Ralph's Cave.
A diver rests on a ledge at the entrance of Dean's Blue Hole.
A diver and anthropologist excavate animal fossils in Sawmill Sink.
A shell from extinct land tortoise from Sawmill Sink Blue Hole.
A photographer shoots an ancient crocodile skull.
Diver moves thru a Ralph's Cave passageway with a hi-def video camera.
Tires and other debris have piled up in Garbage Hole on Grand Bahama.
The entrance of Ben's Cave in Lucayan National Park on Grand Bahama.
An archaeologist lifts a centuries-old Lucayan Indian skull.
Virgo Cave, part of the Zodiac System of blue holes in Sweetings Cay.
A diver collects red dust blown from the Sahara in ancient times.
Divers prepare to dive into Iron Cay.
Dive planning with exploration team at surface of Stargate Blue Hole.
Divers return to Ralph's Cave entrance from science collection dive.
A curator preserving an ancient crocodile skull.
Dive planning with exploration team at surface of Stargate blue hole.
An anthropologist scouts for underwater cave holes on Andros Island.
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