Dododex
ARK: Survival Evolved & Ascended Companion
Tips & Strategies

On THE ISLAND IN ASE the only thing this is useful for is harvesting oil since the only places where metal, obsidian and crystal spawn are in underwater caves and your dunkleosteus can't go in there to harvest them or else it goes above water and dies.
Also if you are clever yes there are some rocks that spawn underwater but they are located near shores so you can use your dunkleosteus to harvest those but there are only a few places where this happens like in the northern shores and at herbivore island.
Remember that this only applies to the dunkleosteus on the map the island and on the game version ase so on other maps dunkles may be more useful and on asa more rocks do spawn underwater.
If you are playing on ark ultimate mobile edition then there are only oily rocks in the ocean as that is ase.
More Dunkleosteus Utility Tips
Probably the most underrated Dino in the game! They can actually harvest a massive amount of metal, crystal, stone, flint, and obsidian. In Ragnorok there is a ravine by the volcano in the highlands underwater, One run in this ravine will give u 10,000 metal ingots and well over 10,000 obsidian from the same dark gray rock.