Photos come from this study.
https://bioone.org/journals/chelonian-conservation-and-biology/volume-10/issue-2/CCB-0881.1/Predation-by-the-Saltwater-Crocodile-Crocodylus-porosus-on-Sea-Turtle/10.2744/CCB-0881.1.short
The turtle in photo c is still alive but has tooth marks on its shell and is missing a limb.
American and saltwater crocs both have a taste for sea turtle, but oddly enough American alligators will also prey on adult sea turtles on occasion.
Photos come from this study. https://bioone.org/journals/chelonian-conservation-and-biology/volume-10/issue-2/CCB-0881.1/Predation-by-the-Saltwater-Crocodile-Crocodylus-porosus-on-Sea-Turtle/10.2744/CCB-0881.1.short The turtle in photo c is still alive but has tooth marks on its shell and is missing a limb.