Sunken Treasure

Near the close of the 1960s, a squadron of young scuba divers headed out into the warm waters of the South Pacific, tanks of air strapped to their backs and syringes at the ready. Their mission, one lethal injection at a time, was to put a stop to an outbreak of crown-of-thorns starfish, a voracious predator of fragile tropical coral reefs. Those early efforts — along with a big printing of "Save the Barrier Reef" bumper stickers — helped establish what has since been considered one of the world's best-protected coral reefs.

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