<p>A school of fish swims past the underwater research laboratory Aquarius, located 62 feet (19 meters) beneath the Florida Keys National Marine Sanctuary.</p>

Aquarius Laboratory

A school of fish swims past the underwater research laboratory Aquarius, located 62 feet (19 meters) beneath the Florida Keys National Marine Sanctuary.

Photograph by Brian Skerry, National Geographic

Underwater Exploration

Slip into a wet suit or hitch a ride on a submersible vessel and discover depths that few have witnessed in this gallery of underwater explorers on the move.

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