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Dermochelys coriacea
this is a giant turtle, i have never seen one so huge , if you look at the pic with the diver in the turtle is looking at him resting under the overhanging rocks and you can see they are not very different in size !
Maybe you want to put the second photo as the cover photo cause the turtle is not very visale in first photo anyway greeat spotting!
sorry but this is not a leatherback sea turtle, is a green turtle (Chelonia mydas)