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Environmental information poster about ecosystem of limestone cenotes, Yucatan, Mexico, North America

Snorkelers swim above a blue hole on Palau's barrier reef. This hole formed when sea level was much lower than it is today.

A diver shines a light in on a cavern filled with glassy sweepers (Pempheris schomburgkii) at Molasses Reef in Key Largo, Florida.

A young married couple celebrate their ten year anniversary by scuba diving in the clear freshwaters of Devil's Den Springs, a sinkhole in Williston, Florida, as the afternoon sun filters down into the cavern.

A scuba diver swims through an underwater field of tape grass leading away from the Blue Springs cave in Merritts Mill Pond in Marianna, Florida.

A scuba diver surfacing and looking up into the light as he ascends from the bottom of Devil's Den, a sinkhole in Williston, Florda.

A technical cave diver using a diver propulsion vehicle (DPV) to dive into the Blue Springs state park cave system near Marianna, Florida.

A scuba diver ascends into the light emanating above through the sink hole into the clear freshwaters of Devil's Den cave near Williston, Florida.

Underwater photographer at the entrance of a cave framed by pink barrel sponges, North Sulawesi, Indonesia.

Diver enters the cavern system at Chac Mool cenote in the Riviera Maya area of Mexico's Yucatan Peninsula.

Two scuba divers in the Garden of Eden cavern part of the cenote system on the Yucatan Peninsula of Mexico.

Scuba diver in the Garden of Eden cavern part of the cenote system on the Yucatan Peninsula of Mexico.

Cave diver lights airspace with flare, inspecting geological formations, Pont Den Gil cave, Menorca, Balearic Islands, Spain, Europe

Scuba diver explores underwater cones in cave, Anhumas abyss, Bonito, Mato Grosso do Sul, Brazil, South America

Scuba divers explore underwater cones in cave, Anhumas abyss, Bonito, Mato Grosso do Sul, Brazil, South America

Scuba diver explores underwater cones in cave, Anhumas abyss, Bonito, Mato Grosso do Sul, Brazil, South America

Scuba diver explores underwater cones in cave, Anhumas abyss, Bonito, Mato Grosso do Sul, Brazil, South America

Scuba divers explore underwater cones in cave, Anhumas abyss, Bonito, Mato Grosso do Sul, Brazil, South America