

These samples were probably studied at the Lost River Laboratory Cache, as this was the main site in which Leviathan class bone samples are found. The Precursors were also studying these remains, as evidenced by small, angular indentations on the ribcage. Smaller versions of its ribs can be seen in the entrance to the Lost River Junction, while a much smaller but otherwise identical skull which also gives the Gargantuan Fossil scan can be found in the Ghost Forest, presumably from a juvenile example of the species.

The skull is so large that a Cyclops can fit inside its jaws. The skeleton is covered in flora and coral.
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The remains consist of a huge, vaguely reptilian skull and sixteen pairs of huge ribs. The skeleton belonged to an eel-like Leviathan Class super-predator dwarfing both the Sea Dragon Leviathan and Sea Emperor Leviathan, despite only being around one third of the whole skeleton. The Gargantuan Fossil is an enormous and ancient fossil, approximately three million years old, found in the Bone Fields.
