Is it possible that the Dunkleosteus is alive there somewhere? The Dunkleosteus is a genus of arthrodire- placoderm fish that lived during the late Devonian, 350 MYA. Recently, the Kaikō submarine got destroyed in 2003. The winch attaching the robot to the boat was cleanly snapped in half, while the sub took a picture of a Dunkleosteus- shaped shadow swimming around the sub. It is the only sighting of a possible Dunkleosteus. The ocean is less explored than space, and so it is quite likely that this fish exists. What do you think?