User blog comment:JakeTehCrabsquis/Theories./@comment-75.37.198.173-20170304061948

maybye the Precursors made that huge animal (now a skeleton) to stop outsiders from going to the DRF and the TP (thermal plant) and PCF (Primary Containment Facility)

and mabye the sea dragon that attacked the DRF was a guard went rogue?