Leatherback turtles are the largest turtles, reaching up to 2,000 pounds. They can dive deeper than any other turtle, sometimes going over 4,000 feet. Unlike other turtles, they lack a hard shell and instead have leathery skin. These turtles play an important role in ocean ecosystems, particularly by helping to control jellyfish populations. As a scuba diver, encountering a leatherback turtle can be a breathtaking experience, highlighting the beauty of ocean biodiversity.