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Leatherbacks are the largest turtles on Earth, and they can dive about 4,000 feet deep. Some swim more than 10,000 miles a year, NOAA says.

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Leatherbacks are the largest turtles on Earth, and they can dive about 4,000 feet deep. Some swim more than 10,000 miles a year, NOAA says.ILLUSTRATION · AI

Leatherbacks are the largest turtles in the world and can dive to approximately 4,000 feet, NOAA Fisheries says.

Adult leatherbacks weigh 750 to 1,000 pounds and measure 5 to 6 feet long. NOAA Fisheries gives their diving depth as approximately 4,000 feet, deeper than any other turtle.

They are highly migratory: some swim more than 10,000 miles a year between nesting and foraging grounds.

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